These plastic couplings are compatible with CPC couplings (Colder) of series APC / EFC12 or LinkTech couplings 50AC / 50PP. The couplings are coupled by pushing the plug in the sleeve until a "click" is heard. Pressing the ergonomic plastic release button (for couplings with a tube connection protected against accidental unlocking) releases the plug once again. It is possible to combine coupling plugs and coupling sockets with and without a shut-off valve and different materials (POM and PP) as desired. The shut-off valve prevents the medium from spilling out when uncoupled.