Auxiliary elements Valve retention 1/2 of 3 way for compressor - Aignep VR12 €10.11 (€8.22 tax excl.) Valve retention (non-return) for compressor with male thread 1/2 of 3 way, body made of brass EN 12164 CW614N (high tensile strength). The main function of this valve is to guarantee the air flow in only one direction, preventing the compressed air from returning to the compressor when it is inactive, becoming an essential element of protection that... View