The couplings of nominal width 2.7 mm are characterised by the smallest possible dimensions of a widely used coupling profile in Germany. The couplings are compatible with Parker-Rectus series 20, Parker-Rectus series 91, Walther series 06-003, Festo model series KD2/KS2, IMI-Norgren series 232, Aventics series CP1-NW 2.7 and many other manufacturers. The couplings are available in brass, nickel-plated brass or stainless steel and are coupled by simply plugging in the coupling plug. Decoupling is done by pulling the sleeve on the coupling. The coupling socket automatically closes after decoupling and should therefore be arranged on the side at which the medium is.