The Alligator Double Seal V2B Gator Cap has its own flow-through sealing valve, allowing users to fill a tire without removing the valve cap. The V2B fits all standard valves and has two built-in heat-resistant grommets to prevent air pressure loss. The grooved surface of the clip-on air chucks provide a reliable hold, and the sealed end face is dirt and water repellent. The V2B Gator Cap can be screwed on by hand and no additional dust cap is required.