Use ABS tee-wyes to build an effective sewage drainage system. They feature a hub thread for secure pipe connection. The sanitary tee-wyes have a right angle that fits into a horizontal or vertical draining system. The 1.5-in sanitary tee-wyes resist thermal expansion for durability. Their acrylonitrile butadiene styrene component resists corrosion. They're black in colour for outdoor installation.