Heater pipe rubber gasket.
4 Required. 2 between flexible pipes under engine and heat exchanger, then 2 between pipes and vehicle.
Some replacement flexible pipes do not need these gaskets check the dimensions of the pipe on line.
T1 / Beetle 62-79.
Karmann Ghia 62-74
T2 / Splitscreen 62-67.
T2 / Baywindow 68-79
Type 3 62-74