Pneuflex's SPEG 12-10 model is 12mm to 10mm O.D tubing stainless steel union tee reducer push to connect air fittings, T shaped body used to connect two pneumatic tubes of 12mm O.D and a reducer tube of 10mm diameter at a 90° angle. Constructed of SS 316 and FKM (Viton) seal, fits for high temperature and corrosive environment. It's very easy to push in and pull out the tubes from SS union tee reducer push to connect fittings without tools help.