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 socket end connections. Please refer to Chemtrol technical data sheets, chemical resistance guides and catalogs for engineering and installation information. Chemtrol Chem-Pure polypropylene exhibits extremely low content of metals, organic compounds, and free ions. No pigments or other adulterants (natural) are a