Nibco 3/4"x3/4" TRN PVC To CPVC Adapter Coupling. This corrosion-resistant and lead-free coupling is made of FlowGuard Gold CPVC, ensuring durability and reliability in hot and cold water pressure distribution systems for residential and commercial use. It features a female socket IPSxfemale socket CTS connection, allowing for easy adaptation between iron pipe size solvent weld connections and copper tube size solvent weld connections.