Pneuflex's SPEG 16-12 model is 16mm x 12mm O.D tubing stainless steel union tee reducer push to connect air fittings, T shaped body used to connect two pneumatic tubes of 16mm O.D and a reducer tube of 12mm diameter at a 90° angle. Constructed of SS 316 and FKM (Viton) seal, which can fit 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.