The couplings of nominal width 19 mm are designed for large flow values. The couplings are compatible with Parker-Rectus series 39 and Hansen series 7000-1" and are available in brass or nickel-plated brass. They are coupled by plugging in the coupling plug. Decoupling is done by pulling the sleeve on the coupling. The coupling sockets closes automatically after decoupling. The coupling socket can be used with shut-off and non-shut-off plugs, as they are delivered with an actuation pin for the cartridge valve.