The design consists of the visual features of the portions of the NASAL DILATOR shown in solid lines in the drawings, whether those features are features of one of shape, configuration, ornament or pattern or are a combination of any of these features.The portions shown in stippled lines do not form a part of the design. The bold, wavy lines do not constitute a feature of the design. They are included for illustrative purposes only in order to define the boundary of the design.Drawings of the design are included, as follows:Fig. 1 is a perspective view of a nasal dilator showing the new design;Fig. 1A is an enlarged fragmentary view of a left side portion of the nasal dilator of Fig. 1;Fig. 1B is an enlarged fragmentary view of a right side portion of the nasal dilator of Fig. 1;Fig. 2 is a front view of the nasal dilator of Fig. 1;Fig. 2A is an enlarged fragmentary view of the left side portion of the nasal dilator of Fig. 2;Fig. 2B is an enlarged fragmentary view of the right side portion of the nasal dilator of Fig. 2;Fig. 3 is a back view of the nasal dilator of Fig. 1;Fig. 3A is an enlarged fragmentary view of the left side portion of the nasal dilator of Fig. 3;Fig. 3B is an enlarged fragmentary view of the right side portion of the nasal dilator of Fig. 3;Fig. 4 is a top view of the nasal dilator of Fig. 1;Fig. 4A is an enlarged fragmentary view of the left side portion of the nasal dilator of Fig. 4;Fig. 4B is an enlarged fragmentary view of the right side portion of the nasal dilator of Fig. 4;Fig. 5 is an end view of the right side portion of the nasal dilator of Fig. 1;Fig. 6 is an enlarged view of Fig. 5;Fig. 7 is an end view of the left side portion of the nasal dilator of Fig. 1;Fig. 8 is an enlarged view of Fig. 7;Fig. 9 is a fragmentary view of the left side portion of the nasal dilator of Fig. 1A; andFig. 10 is a fragmentary view of the right side portion of the nasal dilator of Fig. 1B.