Pneuflex's SPEG 10-06 model is 10mm to 6mm O.D tubing stainless steel union tee reducer push to connect air fittings, T shaped body used to connect three pneumatic tubes, of which size of tubes in the middle is smaller than the two inline tubes. It's very easy to push in and pull out the tubes from SS union tee reducer push to connect fittings without tools help. Constructed of SS 316 and FKM (Viton) seal, which can transfer stream, water, oil, weak corrosive fluids.