The Chemtrol Tru-Bloc true union ball valve is engineered with a self-adjusting seat and upstream and downstream blocking capability to stop flow when an alternate union is removed for servicing the piping system Injection molded PVC construction with FKM o-ring The original Chemtrol true union design allows the valve and operational components to be conveniently lifted from the piping system for repair or replacement Tru-Bloc advances the true union concept with the self-adjusting energizer O-ring The valve can be easily joined with the universal socket and threaded end connection Nibco Chemtrol True Union Ball Valve With Orange Handle, 2"