SPEG 1/2-3/8 model is 1/2" to 3/8" O.D tubing stainless steel 316 union tee reducer push-in tube fittings, T shaped body with three connectors of different diameter size from 1/2 inch to 3/8 inch. 1/2" x 3/8" stainless steel union tee reducer push to connect fittings have a stainless steel 316 body, with 301 SS lock claw & FKM (Viton) seal, which can transfer air, water, oil and weak corrosive fluids, suitable for use with a variety of tubing material including nylon, PA, PE, Teflon...