The 3/8 x 1/4 Plastic Push-In Tube PP DOT Reducing Union Tee T-shaped push-to-connect (PTC) fitting is designed to join two OD tubes with an additional OD branch connection, providing smooth and secure line branching for air or fluid systems. It delivers a reliable, leak-free seal and is commonly used in DOT-approved air brake systems, pneumatic equipment, and fluid transfer applications. The fitting is D.O.T. and SAE compliant, features a one-touch connection for faster installation, and is built with a UV- and vibration-resistant composite body.