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 threaded end connections. Please refer to Chemtrol technical data sheets, chemical resistance guides and catalogs for engineering and installation information. Chemtrol® Kynar® red PVDF exhibits superior strength, working temperature and chemical resistance characteristics. Red pigment provides UV protection. Kynar PVDF offers versatile chemical resistance to slats, strong acids, dilute bases and many organic solvents such as aromatics, aliphadics and chlorinated groups. PVDF is also ideally suited for handling wet or dry chlorine bromine and other halogens. Choose Chemtrol® valves for the most reliable, versatile and economical valve option in commercial and industrial applications. Chemtrol® ball check 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.