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 connections. Please refer to Chemtrol® technical data sheets, chemical resistance guides and catalogs for engineering and installation information. PVC SCH 80/XH exhibits excellent corrosion resistance properties and has the highest long-term hydrostatic strength of any other major thermoplastic material used for piping systems. Chemtrol® PVC valves are lightweight, easy to install, maintenance-free and will not rust, scale, pit or corrode. Choose Chemtrol® valves for the most reliable, versatile and economical valve option in commercial and industrial applications. Chemtrol® valves are backed by a 1 year limited warranty. Because Chemtrol® is a NIBCO® brand the flow-control valves are unsurpassed in quality, performance and longevity.