Pneuflex's SPOC 1/2-04 model is 1/2" O.D connector with R, PT, BSPT 1/2 thread stainless steel hex socket head male straight push in air fittings, with which round shaped body and hex socket helps it can be installed in confined spaced, tightening with a hexagon wrench, used to connect pneumatic components to each other and system piping in a simple push-pull way. 1/2" x R 1/2 stainless steel round male straight push to connect fittings are made to be non corrosive and high resistant to aggressive environment. It can hold nylon tubing, PU tubing, PE tubing, Teflon tubing and transfer air, oil, water and weak corrosive fluids.