Abstract: The utility model provides a tire pressure monitor cap utilizing colors to indicate tire pressure. The tire pressure monitor cap comprises a transparent cover, an alarm bolt, a spring, a floating seat, a rubber pad, a ventilating plate, a metal housing and a gasket; the rubber pad includes a circular protruding seat having a wall higher than that of the outside wall, and a circumferential depression therein, wherein the center is provided with the conical portion, an circular groove arranged outside the protruding seat to receive a hard O-ring inserted thereinto and facilitate inner wall of the O-ring integrated with outer wall of the protruding seat; the O-ring not only increases intensity of the outer wall of the rubber pad by its hard plastic material, but also decreases pressure from the flange of the transparent cover.

Abstract: The utility model provides a tire pressure monitor cap utilizing colors to indicate tire pressure. The tire pressure monitor cap comprises a transparent cover, an alarm bolt, a spring, a floating seat, a rubber pad, a ventilating plate, a metal housing and a gasket; the rubber pad includes a circular protruding seat having a wall higher than that of the outside wall, and a circumferential depression therein, wherein the center is provided with the conical portion, an circular groove arranged outside the protruding seat to receive a hard O-ring inserted thereinto and facilitate inner wall of the O-ring integrated with outer wall of the protruding seat; the O-ring not only increases intensity of the outer wall of the rubber pad by its hard plastic material, but also decreases pressure from the flange of the transparent cover.