ERA SCH 80 PVC TRUE UNION BALL VALVE GREY SOCKET CONNECT PVC true union ball valves offer a simple way to start and stop flow in a system. The term true union means that the carrier or main part of the valve can be removed from the piping system and be either repaired or replaced without completely disassembling the system, saving time and money. ERA true union ball valves are made from durable dark gray PVC and have an easy-to-grip red handle that turns with minimal effort.Unless specifically noted, PVC is not NSF certified.