JP3738132B2 - Method and apparatus for preventing water ingress in grease trap - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method and an apparatus for preventing water from entering a grease trap connected to a drain pipe buried in the ground.
[0002]
[Prior art]
Wastewater discharged from drainage sources such as baths, kitchens, kitchens, washrooms, and toilets in houses and various stores flows through drainage inflow pipes buried in residential areas and grounds, and joins multiple flows. After merging at the installed drainage basin (house basin), it flows through the drainage outflow pipe (drainage main pipe).
Then, the wastewater flows through a public pit installed inside or outside the residential land or site and a drain pipe connected thereto, and then discharged to a public sewer main outside the residential land or site.
[0003]
Of the various wastewater sources, wastewater discharged from residential kitchens, restaurant / restaurant kitchens, gas stations, etc. often contains oil and waste (solid matter). If such wastewater containing oil and waste is discharged into the sewer main as it is, it not only hinders sewage treatment in the sewage treatment plant, but also causes blockage of the pipeline.
Therefore, in many cases, such a drainage pipe through which drainage flows is connected to a grease trap that collects dust and separates oil. This grease trap is a kind of drainage tub, but has a function of separating at least oil from the drainage.
[0004]
By the way, the drainage pipe constituted by the drainage inflow pipe and the sewer main pipe has a sealed structure as a whole. A drainage basin such as a public urn does not often open the lid, and the lid is attached to the basin body with a good sealing structure to form a sealed structure.
This is because when so-called unknown water such as rainwater or groundwater enters the drainage pipe, there is a problem that the amount of drainage increases and the load on the sewage treatment plant increases, and when rainwater enters the drainage pipe during a typhoon, etc. This is because sewage containing rainwater may blow out from the drainage basin of the downstream house.
[0005]
[Problems to be solved by the invention]
As described above, among the constituent members that constitute the drainage pipe line that generally requires a sealed structure, the grease trap needs to be frequently subjected to the removal and inspection of the separated oil and dust.
Therefore, the lid of the grease trap is detachably attached to the lid receiving frame so that it can be easily opened and closed. Conventionally, measures have been taken to prevent rainwater from entering the inside of the grease trap. Was hardly taken.
[0006]
FIG. 10 is a sectional view showing a part of a conventional grease trap.
As shown in FIG. 10, in the conventional grease trap 1, a lid receiving frame 3 is fixed to the container body 2. The lid 5 having the reinforcing member 4 is detachably attached to the lid receiving frame 3.
By fixing a rubber packing 6 to the lid receiving frame 3, the space between the reinforcing member 4 of the lid 5 and the lid receiving frame 3 is sealed.
[0007]
Since there is a gap 7 between the periphery of the lid 5 and the lid receiving frame 3, the rainwater 8 flows into the space 9 through the gap 7. Although the reinforcing member 4 of the lid 5 is placed on the packing 6, the reinforcing member 4 and the packing 6 are not completely in close contact with each other. The grease enters the inside 10 of the grease trap 1 through the gap between the packing 6.
[0008]
The present invention has been made to solve such problems, and provides a method and apparatus for preventing rainwater and the like from entering the grease trap from between the lid receiving frame and the lid of the grease trap. For the purpose.
[0009]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, the water intrusion prevention method in the grease trap according to the present invention is connected to a drain pipe buried in the ground and is attached to the lid receiving frame in a detachable manner. A method for preventing water from entering the lid receiving frame in which an annular recess is formed, and a drain outlet for discharging water that has flowed into the recess is formed in advance, and the grease trap When the water is installed in the ground, by forming a water introduction hole communicating with the drain port in the vertical direction in the ground, the inflow water in the recessed portion flows from the drain port through the water guide hole. The drain port is a through hole formed in the bottom of the lid receiving frame, and the water guide hole is formed by inserting a rod-like member into the through hole when the grease trap is installed in the ground. Placed vertically It formed by withdrawing the bar-like member After fixing the grease trap in the ground state.
[0010]
A water intrusion prevention device in a grease trap that is suitable for carrying out the above method is connected to a drain pipe buried in the ground and also has water in the grease trap in which a lid is detachably attached to a lid receiving frame. An apparatus for preventing the intrusion of water, wherein a drain outlet for discharging water flowing into the indented portion is formed in the lid receiving frame in which an annular indented portion is formed, and a water guide hole communicating with the drain outlet Is formed vertically in the ground, and the inflow water in the indented portion is allowed to flow into the ground through the water introduction hole from the drainage port , and the drainage port is formed through the bottom portion of the lid receiving frame. When the grease trap is installed in the ground, the water guide hole is inserted into the through-hole and the grease trap is fixed in the ground in a state in which the grease trap is placed in the ground. Remove the parts It is to so that is formed by.
[0011]
In the above method and apparatus, the lid caddy is fixed and sealed to the container body of the grease trap while being integrally formed in an annular shape with a cross section substantially U-shaped, wherein the front Kifuta lid The contact portion with the receiving frame is preferably sealed with an elastic member.
[0012]
In the above method and apparatus, the lid receiving frame, while being integrally formed with the upper edge of the container body of the grease trap and a the bottom portion and the outer rising portion, the inner side of the grease trap in the bottom The hollow portion may be formed by the elastic member fixed to the upper surface of the substrate, the bottom portion and the outer rising portion, and the drain port may be formed in the bottom portion.
[0013]
Further, in the method and apparatus, the lid seals the handle attached in a retractable manner and a sliding portion of the handle to prevent water on the upper surface of the lid from entering the inside of the grease trap. It is preferable to provide a sealing member.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an exemplary embodiment of the present invention will be described with reference to FIGS.
[0015]
(First embodiment)
FIG. 1 is a perspective view showing a part of a drain pipe using a grease trap.
Wastewater containing oil and garbage (solid matter) is often discharged from wastewater sources such as kitchens in restaurants, kitchens of restaurants and restaurants, and gas stations. In FIG. 1, the case where the waste_water | drain 22 containing an oil component and garbage is discharged | emitted from the kitchen sink 21 of the house 20 is shown.
[0016]
The drainage 22 flows into the grease trap 24 through the drainage inflow pipe 23 connected to the sink 21. The grease trap 24 is buried in the ground, and the drainage 22 always accumulates to a certain level in the container main body 29.
The grease trap 24 is provided with a basket 25 disposed at the inflow portion of the drainage 22 and an oil / water separation portion 26 disposed on the downstream side of the basket 25. Since the basket 25 has a large number of holes, dust is removed from the drainage 22 flowing into the basket 25.
[0017]
The oil / water separator 26 includes an inclined plate 27 and a net-like contact material 28 filled in the middle of the flow path of the drainage 22. When the drainage flows through the oil / water separator 26, the oil 30 contained in the drainage 22 is separated by the inclined plate 27 and floats on the water surface. Further, the oil particles in the water are also removed by the contact material 28.
Thus, the waste water from which the dust and oil are removed by the grease trap 24 flows through the drain outlet pipe 31 connected to the grease trap 24, and then joins the drain main pipe (not shown) at the junction. A drainage basin is installed at this junction.
[0018]
The wastewater that has flowed through the drainage pipe through the drainage basin passes through the public pit, which is another drainage basin installed inside or outside the residential land, and flows through the drainage pipe to the large-diameter public sewer main outside the residential land. Join. This sewer main is buried deep underground such as a road outside the residential area.
The drainage inflow pipe 23, grease trap 24, drainage outflow pipe 31, drainage dredge, drainage main pipe, public dredging, drainage pipe, sewer main, and the like constitute a drainage pipe 32 buried in the ground and having a predetermined gradient. ing.
[0019]
Next, a method and apparatus for preventing water from entering the grease trap 24 will be described.
2 is a partial enlarged cross-sectional view showing a construction method for preventing water intrusion, FIG. 3 is a perspective view showing a lid receiving frame and a lid of the grease trap 24, and FIG. 4 is an enlarged cross-sectional view showing a lid handle part. FIG. 5 is a partially enlarged cross-sectional view showing a use state after the grease trap 24 is installed.
[0020]
As shown in FIGS. 1 to 5, the grease trap 24 is connected to a drain pipe 32 embedded in the ground, and two lids 34 can be detachably attached to the lid receiving frame 33. ing.
The container body 29 is integrally formed using a synthetic resin such as fiber reinforced plastic (FRP), hard vinyl chloride resin, or polypropylene.
The lid receiving frame 33 is constituted by a pair of units 35 integrally formed of an iron plate material. The two units 35 are connected and fixed by fastening members such as a plurality of bolts and nuts 36 to form a rectangular shape corresponding to the upper opening of the container main body 29. The connecting portion of the two units 35 is sealed with a sealant.
[0021]
The lid 34 is integrally formed of an iron plate material and is detachably attached to each unit 35 of the lid receiving frame 33. The lid receiving frame 33 and the lid 34 may be formed of a synthetic resin such as FRP.
By using two lids 34, the weight is reduced and the attaching / detaching work is facilitated. By fixing an L-shaped reinforcing member 39 to the back surface of the lid 34, the lid 34 is prevented from being deformed.
A plurality of handles 37 are attached to the lid 34 so as to be able to appear and retract. The lid 34 is provided with a seal member 37a for sealing the sliding portion 37b of the handle 37. The seal member 37a prevents water on the upper surface of the lid 34 from entering the inside 38 of the grease trap.
[0022]
In the present invention, measures are taken to prevent rainwater 8 and other water from entering the interior 38 of the grease trap 24 from between the periphery of the lid 34 and the lid receiving frame 33.
In this method, a drain outlet 41 for discharging rainwater 8 that has flowed into the recess 40 is formed in the lid receiving frame 33 in which the annular recess 40 is formed, and the grease trap 24 is installed in the ground. In doing so, a water guide hole 43 communicating with the discharge port 41 is formed in the vertical direction in the ground. In the present invention, the term “longitudinal direction” includes not only a direction orthogonal to the horizontal direction but also a case where it is inclined.
Thereby, the inflow water 44 in the hollow part 40 is made to permeate into the ground through the water introduction hole 43 from the drain port 41.
[0023]
In the present embodiment, the drain port 41 is a through hole formed in the bottom 46 of the lid receiving frame 33. The through-holes 41 are formed at the four corners of the unit 35 of the lid receiving frame 33 (that is, eight places as a whole of the lid receiving frame 33).
The water guide hole 43 is formed in the vertical direction below the through hole 41. The water guide hole 43 is formed after the grease trap 24 is fixed in the ground in a state where a rod-like member such as an elongated pipe 47 or a rod is inserted into the through hole 41 and arranged in the vertical direction when the grease trap 24 is installed in the ground. It is formed by extracting the pipe 47. As the pipe 47, a hard vinyl chloride pipe or the like is used.
The water guide hole 43 is preferable because the water penetration rate increases as the surface area in the ground increases (that is, the diameter and length increase), and if the earth and sand 70 is sand, the penetration rate is further increased.
[0024]
Each unit 35 constituting the lid receiving frame 33 has a substantially U-shaped cross section and is integrally formed in a rectangular ring shape. The lid receiving frame 33 includes a bottom portion 46 facing in the horizontal direction, an inner rising portion 55 and an outer rising portion 56. The inner rising portion 55 and the outer rising portion 56 are integrally formed substantially vertically at the inner end and the outer end of the bottom portion 46 respectively upward.
The lid receiving frame 33 is fastened and fixed to the upper end edge 50 of the container main body 29 via fastening members such as a plurality of bolts and nuts 51.
Since the joint portion 57 between the container main body 29 and the lid receiving frame 33 is sealed all around by the seal member 52, water does not enter the inside 38 of the grease trap 24 from the joint portion 57.
[0025]
A plurality of anchor members 49 protruding outward are fixed to the outer peripheral surface of the lid receiving frame 33. By this anchor member 49, the lid receiving frame 33 can be firmly fixed to the concrete (or asphalt) 71.
The anchor member 49 may fix a reinforcing bar to the lid receiving frame 33 by welding. However, the anchor member 49 is transported to the installation site with a nut welded to the lid receiving frame 33 in advance, and the bolt is used as a nut at the installation site. It is preferable to screw into the anchor member 49.
In this way, since the anchor member 49 does not protrude when the lid receiving frame 33 is transported, it is possible to prevent damage to the anchor member 49 or injury due to contact.
[0026]
A contact portion 53 between the upper end portion of the lid receiving frame 33 and the lid 34 is sealed with an elastic member such as a rubber packing 54. The packing 54 is arranged in an inverted U shape and is fixed over the entire periphery of the upper end edge of the inner rising portion 55. Therefore, when the lid 34 is placed on the lid receiving frame 33, the contact portion 53 is sealed by the packing 54.
A water intrusion prevention device 48 suitable for carrying out the above method forms a drain outlet 41 for discharging the water 44 flowing into the indented portion 40 in the lid receiving frame 33 in which the annular indented portion 40 is formed. Then, the water guide hole 43 communicating with the drain port 41 is formed in the vertical direction in the ground, and the inflow water 44 in the recessed portion 40 flows through the water guide hole 43 from the drain port 41 and penetrates into the ground.
[0027]
FIG. 6 is a view showing a modification of the first embodiment, and corresponds to FIG.
In the example shown in FIG. 6, the contact portion 53 between the bottom 46 of the lid receiving frame 33 and the lid 34 is sealed with an elastic member such as a rubber plate-like packing 60. The elongated endless annular packing 60 is fixed to the upper surface of the bottom 46. The packing 60 is disposed closer to the inside 38 of the grease trap than the position where the through hole 41 is formed.
An L-shaped support member 61 is disposed on the entire lower surface of the lid 34. When the support member 61 is placed on the packing 60, the contact portion 53 is sealed with the packing 60.
[0028]
FIG. 7 is a partially enlarged perspective view showing another modification of the first embodiment.
In the lid receiving frame 33 shown in FIG. 7, a drain port 62 is formed by cutting out a part of the outer rising portion 56. In addition, a pipe 63 whose lower end opens to the lower part of the ground is arranged in the vertical direction.
The pipe 63 is disposed beside the lid receiving frame 33. An opening 64 is formed in the pipe 63 at a location corresponding to the drain outlet 62. In this way, the inside of the pipe 63 exhibits the function of the water guide hole 65 communicating with the drain port 62.
Thereby, the inflow water in the hollow part 40 of the lid receiving frame 33 can be permeated into the ground through the water introduction hole 65 through the opening 64 from the drain port 62.
[0029]
As shown in FIGS. 1 to 5, when the grease trap 24 having this configuration is installed, after the lid receiving frame 33 in which the through holes 41 are formed in advance is fixed to the container body 29, the grease trap 24 is put into the ground. Install in. And the earth and sand 70 are backfilled in the state which inserted the pipe 47 to the through-hole 41 in the vertical direction.
Next, concrete (or asphalt) 71 is poured onto the earth and sand 70, and the lid receiving frame 33 and the like are fixed by the concrete 71.
[0030]
After the earth and sand 70, the concrete 71 and the like are sufficiently hardened, if the pipe 47 is pulled upward, a water introduction hole 43 is formed in the lower portion of the through hole 41 as shown in FIG. If the lid 34 is attached to the lid receiver 33 when the grease trap 24 is used, the inside 38 of the grease trap 24 is shielded from the outside.
[0031]
In the grease trap 24, when it is raining, the rainwater 8 may flow into the recessed portion 40 from the gap 72 between the periphery of the lid 34 and the outer rising portion 56.
However, the inflowing water 44 in the recess 40 penetrates into the ground from the through hole 41 through the water guide hole 43 and therefore does not enter the inside 38 of the grease trap.
Moreover, since the contact portion 53 at the upper end portion of the inner rising portion 55 is sealed by the packing 54, even if the amount of water 44 flowing into the indentation portion 40 is large, the contact portion 53 and the inside 38 of the grease trap can be obtained. There is almost no risk of water entering.
[0032]
Further, since the sliding portion 37b of the handle 37 of the lid 34 is sealed by the sealing member 37a, the rain water 8 on the upper surface of the lid 34 enters the inside 38 of the grease trap 24 through the sliding portion 37b. Can be prevented.
Since the lid 34 is placed on the lid receiving frame 33 via the packing 54 or 60, no noise is generated at the contact portion 53 when the lid 34 is attached or detached.
In the present embodiment, the case is shown in which the through holes 41 are formed at eight locations in the entire cover receiving frame 33 and the water guide holes 43 are formed in the lower portions of the through holes 41. The number can be set arbitrarily.
[0033]
As shown in FIG. 3, although the case where the lid receiving frame 33 is divided into two parts is shown in the present embodiment, it may be divided into three parts or more or may not be divided. For example, the lid receiving frame may be integrally formed in one rectangular shape as a whole without being divided into the two units 35.
In this case, one spanning member is detachably looped over almost the center of the lid receiving frame and the grease trap is covered with two lids, or two spanning members are attached to the lid receiving frame. The grease trap is covered with three lids so as to be detachable and parallel in the middle, and these lids are supported by the lid receiving frame and the spanning member.
[0034]
Therefore, when performing inspections and operations for cleaning by inserting and removing the basket 25 and the contact material 28 inside the grease trap, the cover member can be operated by opening the grease trap cover and removing the cover member. Workability is improved because it does not get in the way.
It is preferable that the upper surface of the spanning member is formed in a groove shape extending in the longitudinal direction and that the gap between the spanning member and the lid is sealed with a packing.
In this way, the rainwater on the lid flows through the groove on the upper surface of the spanning member, and then flows down into the recessed portion 40 of the lid receiving frame and finally penetrates into the ground. Can be prevented from entering the interior.
[0035]
(Second Embodiment)
8 and 9 are partially enlarged cross-sectional views showing a second embodiment of the present invention, and show a state where a grease trap cover is removed and a state where it is attached.
As shown in FIGS. 8 and 9, the lid receiving frame 80 is formed integrally with the upper end edge of the container body 82 of the grease trap 81, and includes a bottom portion 83 and an outer rising portion 84. The lid 90 is detachably attached to the lid receiving frame 80.
[0036]
An annular recess 88 is formed by the packing (elastic member) 87 fixed to the upper surface 86 of the bottom 83, the bottom 83 and the outer rising portion 84.
The packing 87 is fixed to the bottom upper surface 86 on the inside 85 side of the grease trap 81, and has a relatively thick shape. As the material of the packing 87, waterproof rubber (sponge rubber) or ept sealer is preferable.
The bottom 83 is provided with a drainage port 89 for discharging water such as rainwater 8 that has flowed into the recess 88. A water guide hole 91 communicating with the drain port 89 is formed in the vertical direction in the ground. The method for forming the water guide hole 91 is the same as that of the first embodiment.
[0037]
Since the inflow water in the hollow portion 88 flows through the water introduction hole 91 from the drain port 89 and permeates into the ground, the same operational effects as the first embodiment are exhibited.
By forming the upper edge of the container main body 82 in a bent manner, the lid receiving frame 80 is formed integrally with the container main body 82, so that it is not necessary to attach the lid receiving frame 80 separately. Therefore, the number of parts of the grease trap is reduced, the manufacturing is facilitated and the manufacturing cost can be reduced.
[0038]
In the grease traps 24 and 81 of the present invention, rainwater or the like can be prevented from entering the grease trap from between the lid receiving frame and the lid, so that rainwater or the like does not enter the drain pipe 32. Further, since the lid is simply placed on the lid receiving frame, the lid can be easily attached and detached.
In each of the above-described embodiments, the case where the lid receiving frame and the lid are rectangular has been described. However, a circular shape, an elliptical shape, or the like may be used.
Since drainage always accumulates inside the grease trap, the grease trap will not rise due to the buoyancy of water in the ground even if rainwater penetrates into the ground through the water guide hole.
In the drawings, the same reference numerals denote the same or corresponding parts.
[0039]
【The invention's effect】
Since the present invention is configured as described above, and the water guide hole communicating with the drain port is formed in the vertical direction in the ground, the inflow water in the recessed portion of the lid receiving frame flows through the water guide hole from the drain port and is underground. Thus, rainwater or the like can be prevented from entering the grease trap from between the lid receiving frame and the lid of the grease trap.
[Brief description of the drawings]
FIG. 1 to FIG. 7 are views showing a first embodiment of the present invention, and FIG. 1 is a perspective view showing a part of a drain pipe using a grease trap according to the present invention.
FIG. 2 is a partial enlarged cross-sectional view showing a construction method for preventing water from entering.
FIG. 3 is a perspective view showing a lid receiving frame and a lid of a grease trap.
FIG. 4 is an enlarged cross-sectional view showing a handle portion of the lid.
FIG. 5 is a partially enlarged cross-sectional view showing a use state after the grease trap is installed.
FIG. 6 is a view showing a modification of the first embodiment and corresponding to FIG.
FIG. 7 is a partially enlarged perspective view showing another modification of the first embodiment.
FIG. 8 is a diagram showing a second embodiment of the present invention, and is a partially enlarged sectional view showing a state where a lid of a grease trap is removed.
FIG. 9 is a partially enlarged sectional view showing a state where a lid is attached.
FIG. 10 is a sectional view showing a part of a conventional grease trap, corresponding to FIG.
[Explanation of symbols]
8 rain water (water)
24, 81 Grease trap 29, 82 Container body 32 Drain pipe 33, 80 Lid receiving frame 34, 90 Lid 37 Handle 37a Seal member 37b Sliding part 38, 85 Inside grease trap 40, 88 Recessed part 41 Through hole (drainage mouth)
43 , 9 1 Water guide hole 44 Inflow water 46 Bottom 47 Pipe (bar-shaped member)
48 Water intrusion prevention device 53 Contact part 54, 60 Packing (elastic member)
56,84 Outside rising part
8 3 Bottom portion 86 Top surface 87 Packing (elastic member)
89 Drain port

Claims (8)

A method for preventing water from entering the interior of the grease trap, which is connected to a drainage pipe buried in the ground and removably attaches a lid to a lid receiving frame,
In the lid receiving frame in which the annular recess portion is formed, a drain outlet for discharging the water flowing into the recess portion is formed in advance,
When the grease trap is installed in the ground, by forming a water guide hole communicating with the drain outlet in the vertical direction,
The inflow water in the indented portion is allowed to flow into the ground through the water introduction hole from the drain port ,
The drain port is a through hole formed in the bottom of the lid receiving frame, and the water guide hole is arranged vertically by inserting a rod-like member into the through hole when the grease trap is installed in the ground. entry preventing method for water in the grease trap, characterized that you formed by at state withdrawing the rod-shaped member After fixing the grease trap in the ground. The lid receiving frame has a substantially U-shaped cross section and is integrally formed in an annular shape and is sealed and fixed to the container body of the grease trap;
  The method for preventing water from entering a grease trap according to claim 1, wherein a contact portion between the lid and the lid receiving frame is sealed with an elastic member. The lid receiving frame is formed integrally with the upper end edge of the container body of the grease trap and includes the bottom and an outer rising portion,
  The indented portion is formed by the elastic member fixed to the upper surface on the inner side of the grease trap at the bottom, and the bottom and the outer rising portion,
  2. The method for preventing water from entering a grease trap according to claim 1, wherein the drain port is formed in the bottom portion. The lid includes a handle that can be moved in and out, and a seal member that seals the sliding portion of the handle and prevents water on the upper surface of the lid from entering the inside of the grease trap. The method for preventing water from entering into the grease trap according to claim 1, wherein: A device for preventing water from entering the inside of the grease trap, which is connected to a drainage pipe buried in the ground and detachably attaches a lid to a lid receiving frame,
In the lid receiving frame in which an annular recess is formed, a drain outlet for discharging water flowing into the recess is formed, and a water guide hole communicating with the drain outlet is formed in the vertical direction in the ground, The inflow water in the indented portion is allowed to flow into the ground through the water introduction hole from the drain port ,
The drain port is a through hole formed in the bottom of the lid receiving frame, and the water guide hole is arranged vertically by inserting a rod-like member into the through hole when the grease trap is installed in the ground. In this state, the grease trap is fixed to the ground, and then the rod-shaped member is pulled out . The lid receiving frame has a substantially U-shaped cross-sectional shape and is integrally formed in an annular shape and is sealed and fixed to the container body of the grease trap ;
Intrusion prevention device for water in the grease trap according contact portions to claim 5, characterized in that the sealing of an elastic member between the front Kifuta and the lid receiving frame. The lid receiving frame is provided with said bottom portion and the outer rising portion while being integrally formed with the upper edge of the container body of the grease trap,
The indented portion is formed by the elastic member fixed to the upper surface on the inner side of the grease trap at the bottom, and the bottom and the outer rising portion,
6. The apparatus for preventing water from entering a grease trap according to claim 5 , wherein the drain port is formed in the bottom portion. The lid includes a handle that can be moved in and out, and a seal member that seals the sliding portion of the handle and prevents water on the upper surface of the lid from entering the inside of the grease trap. The water intrusion prevention device for a grease trap according to claim 5, 6 or 7 .

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