SPEG 3/8-5/16 model is 3/8" to 5/16" O.D tubing stainless steel 316 union tee reducer push-in tube fittings, T shaped body with three connectors of different diameter size, used to connect three pneumatic tubes of in a simple push-pull way. 3/8" x 5/16" stainless steel union tee reducer push to connect fittings have a stainless steel 316 body, with 301 SS lock claw & FKM (Viton) seal, making it fit for high temperature and corrosive environment, suitable for use with a variety of tubing material including nylon, PA, PE, Teflon...