The design consists of the visual features of the SUCTION TIP shown in the drawings, whether those features are one of shape, configuration, ornament or pattern or are a combination of any of these features. The stippled lines shown in the drawings represent features of the SUCTION TIP which do not form part of the design.Drawings of the design are included, in which:Figure 1 is a right side elevation view of a SUCTION TIP, the left side elevation view being a mirror image thereof;Figure 2 is a front elevation view thereof;Figure 3 is a rear elevation view thereof;Figure 4 is an enlarged top plan view thereof;Figure 5 is an enlarged bottom plan view thereof;Figure 6 is a right side elevation view of a first variant of the SUCTION TIP, the left side elevation view being a mirror image thereof;Figure 7 is a front elevation view thereof;Figure 8 is a rear elevation view thereof;Figure 9 is an enlarged top plan view thereof;Figure 10 is an enlarged bottom plan view thereof;Figure 11 is a right side elevation view of a second variant of the SUCTION TIP, the left side elevation view being a mirror image thereof;Figure 12 is a front elevation view thereof;Figure 13 is a rear elevation view thereof;Figure 14 is an enlarged top plan view thereof;Figure 15 is an enlarged bottom plan view thereof;Figure 16 is a right side elevation view of a third variant of the SUCTION TIP, the left side elevation view being a mirror image thereof;Figure 17 is a front elevation view thereof;Figure 18 is a rear elevation view thereof;Figure 19 is an enlarged top plan view thereof;Figure 20 is an enlarged bottom plan view thereof;Figure 21 is a right side elevation view of a fourth variant of the SUCTION TIP, the left side elevation view being a mirror image thereof;Figure 22 is a front elevation view thereof;Figure 23 is a rear elevation view thereof;Figure 24 is an enlarged top plan view thereof;Figure 25 is an enlarged bottom plan view thereof;Figure 26 is a right side elevation view of a fifth variant of the SUCTION TIP, the left side elevation view being a mirror image thereof;Figure 27 is a front elevation view thereof;Figure 28 is a rear elevation view thereof;Figure 29 is an enlarged top plan view thereof; andFigure 30 is an enlarged bottom plan view thereof.