Made of brass, this Watts reducer compression T-fitting is designed for strength, durability and rust resistance. The compression ends on the run have a 3/8" outside diameter and the branch has a 1/4" outside diameter. The reducing tee fitting is ideal for use with copper, brass, aluminum or plastic tubing. It is typically used for gasoline, grease, oil, water, vacuum and air line applications. The fitting is not recommended for use with steel tube.