Teflon tape, known as thread seal tape is actually a polytetrafluoroethylene used on tape and is popularly used for plumbing the sealing pipe threads. The Teflon tapes can be used on the air fittings. However, no sealant is required or advised on the quick-connect part itself. In the market, there are several types of quick-connect air fittings which appear similar, but they don't need to be compatible. Among all those that are offered, the most common categories are Automotive and Industrial, which in turn, have many subtypes.