For connecting a PVC hose to a tap or endpiece. The components of this highly robust & durable quick-action coupling system are precisely lathed from solid brass. The springs & balls which make the couplings function are made from stainless steel, the seals are rubber, the clamps are plastic. The couplings are compatible with all current plastic hose coupling systems (e.g. Gardena). Those who decide on this system can carry on using their existing hose couplings & modify them gradually. The system is suitable for typical 1/2" garden hoses.