CPVC will not rust, pit, scale or corrode.Made of FlowGuard gold resin CPVCUse with hot and cold-water pressure distribution systemsNot for use with compressed air or other gasesSolvent-welded connectionsEasy to install and join by solvent cementing or threadingLead free The NIBCO CPVC-CTS transition coupling is made of FlowGuard Gold CPVC and is ideally suited for hot and cold water pressure distribution systems in residential and commercial applications. Because of its longstanding reputation for innovation and precision in design and manufacturing, NIBCO is the preferred brand in the industry. 1 in.