These bushings are used to connect two different size pipes and are available in a range of size combinations. They have a spigot fitting on the outside and a socket fitting on the inside. A socket x socket coupler is needed to connect the spigot side of the fitting to the existing pipe. UPVC Pressure Fittings: SCH 40 & 80 SCH Size Available: 1/2" x 3/4" to 12" x 6" For Cold Water Use Only.