Inflator

FIG. 1 is an isometric view of a top, front, and right side of an ornamental design for an inflator; FIG. 2 is a front elevational view of the inflator of FIG. 1 ; FIG. 3 is a rear elevational view of the inflator of FIG. 1 ; FIG. 4 is a right side elevational view of the inflator of FIG. 1 ; FIG. 5 is a left side elevational view of the inflator of FIG. 1 ; and, FIG. 6 is a top plan view of the inflator of FIG. 1 . The dash-dash-dash lines are included for the purpose of illustrating portions of the inflator that form no part of the claimed design.