... manufacturer supply free sample durable CAMLOCK COUPLING/QUICK COUPLINGStainless steel quick coupling type A,B,C,D,E, ... ,sanitary valve,check valve,strainer etc.2.Pipe fittings:elbow 45,elbow 90,tee,cross,union,cap,socket,coupling ... ,plug,nipple,bushing etc.3.Quick coupling: type A,B,C,D ... for customers special demands. quick connect hose coupling fittings