These quick couplings and coupling plugs with PLC profile nominal width 5.5 are mainly used in Great Britain and Ireland. The couplings are compatible with PLC standard couplings and Rectus-couplings of series 19. This coupling type is also called a “PCL coupling” and usually used in workshops. The hardened steel slider sleeve makes the coupling suitable for very rough industrial use as well. Attention: This plug profile is not very common in Germany.