Pneuflex's SPEG 14-12 model is 14mm 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 14mm O.D and a reducer tube of 12mm diameter at a 90° angle. Constructed of SS 316 and FKM (Viton) seal, which can transfer stream, water, oil, weak corrosive fluids. It's very easy to push in and pull out the tubes from SS union tee reducer push to connect fittings without tools help.