Warm Air Pipe VW T2 1600cc 1967-1979 Beetle 1967 onPre heat pipe for warm air. This warm air pipe directs hot air from the exhaust in to the air filter and helps prevent your inlet manifold icing up. Warm air pipe. Fits all upright air cooled engines from 1967. The pipe takes a 50mm flexible hose similar to the cooling pipes. Not all vehicles have a suitable tinware hole and some air filters have a smaller 25mm flexible hose. T1 if fitted & T1 CAB if fitted KG if fitted, T2 if fitted