Features and Benefits:•Fits all standard valves•Built-in high heat-resistant grommets to prevent air pressure loss•Water- and dirt-repellent sealed end face•No additional dust cap required•Quick and simple installation - remove old valve cap, screw on Alligator V2B™ by hand - DONE!•Alligator Double Seal V2B™ Valve Caps. Alligator GATOR Double Seal V2B™ valve caps not only protect your valves from water and dirt, they allow you to check air pressure and inflate your tires WITHOUT removing the valve cap!Seal Concept: The integrated check valve with two high temperature seals prevents pressure loss even when the valve core is damaged or dirty. The end surface is completely sealed and insensitive to dirt and water.