SPOC 5/16-02 is a model number of 5/16" O.D tubing with R 1/4 male thread hex socket head male connector stainless steel push in air fittings. Its round shaped body with internal hexagon helps it to be installed anywhere space is limited, tightening with a hexagon wrench. 5/16" x R 1/4 stainless steel round male straight push to connect air fittings are made to be non corrosive and highly resistant to aggressive environment, as well as corrosive fluids. 5/16" x R 1/4 SS male connector pneumatic fittings can hold nylon tubing, PU tubing, PE tubing, Teflon tubing and be very easy to push in and push out the tubes without tools help.