Description:It creates an airtight seal from the rubber washer built in. Can be screwed onto any Schrader (car valve style) type valve. Simply screw the valve extender onto the valve. Screw on with internal rubber grommet. Can be left on valve.A valve extender is used for valves that are not long enough to reach a pump headThese are also used for valves to make it easier for you to pump, so you won't need to buy new tubes with longer valvesThis valve extender can be used on cars, boat trailers, trailers, motorbikesEasy to screw on and easy to screw off, so you can leave it in your tool box, car or pocketMade of high quality with metal, it is durable and tough, can be used for a long timeDimensions: bottom outer diameter 10mm, bottom internal thread 8V1, head external thread 8V1, total length 40mmWeight: 14gColor: SilverMaterial: pure copperQuantity: 1 setPackage package: 1 pair of car American valves