These quick couplings and coupling plugs with British profile nominal width 5 are mainly used in Great Britain, Ireland, and some European countries. The couplings are compatible with Schrader couplings NW 5 and Rectus-couplings of series 17. This coupling type is often also referred to as a “Schrader coupling”. The steel sliding sleeve and the steel body (both hardened and galvanized or nickel-plated) makes the coupling suitable for very rough industrial use as well. Attention: This plug profile is not very common in Germany.