... as your design. 3.Various materials. 4.Good quality. quick coupling features:1.It can be used under a variety of ... leakage,surface finishing and thread test.5.Common working fluids:pneumatic,hydraulic,fluids,steam,water,oil,fuel,chemical,gas,or other ... ″,1″,1 1/4″,1 1/2″,2″. Quick release coupling