With this little gasket, it simply installs between the racers air bottle and regulator providing a leak free seal at the air bottle valve.
Don't trust a plastic washer to seal that can crack or break treat yourself to one of these and be done with it.
Gasket is made from aerospace type material with a steel shim in the center for durability and strength. Gasket thickness is .090", O.D. is .750" and I.D. hole is .270".
Gaskets are sold each.
Works with all Lenco and B&J air bottles.