On Type 1 Beetle from 08/67 you can find at the underside of the lateral heater channels inspection holes at the front as well as at the rear, that allow to inspect the inside of the channels. These holes were sealed in the factory by means of rubber valves. After many years these valves can get hardened and/or lost. From now on BBT presents you these valves in an original quality from stock. For 1 vehicle you need 4 of them.