T-H Marine barbed wye fittings Y fittings are molded specifically to fit marine hose dimensions. A fitting with three openings, a wye is used to create branch lines. It is a type of tee fitting which has the side inlet pipe entering at a 45 angle, or an angle other than 90 degrees. A standard wye is a Y shaped fitting which allows one pipe to be joined to another at a 45 degree angle. Wyes are similar to tees except that the branch line is angled to reduce friction and turbulence that could hamp