It's a variety of Tee which has the branch at a forty five° angle, or an angle other than 90°. Wye tee will allow one particular pipe to be joined to another at a forty five° angle. This type of tee cuts down friction and turbulence that can hamper the http://valves-and-fittings37383.ampblogs.com/valves-and-fittings-Fundamentals-Explained-26288801