Unions connect two pipes in a way that ensures easy assembly/disassembly by requiring only one pipe to be turned when removing the union. CPVC CTS fittings are used for hot and cold water pressure distribution systems in residential and commercial applications. CPVC has physical properties at 73° F similar to those of PVC, and its chemical resistance is similar to or better than that of PVC. CPVC will not rust, pit or scale. It can withstand low pH water, coastal salt air exposure and corrosive soils. In addition, CPVC is not subject to electrolysis, so underground burial has no effect on performance. Conforms to ASTM Standards D 2846 for material, performance and geometric requirements. These fittings are joined by threading or solvent cementing and can easily be connected to steel or copper through the use of transition fittings.