Balanced shut-off valve for vacuum through high pressure. Normally-closed. The "balanced" aspect means that the valve will close even if the back pressure is higher than the inlet pressure. Offered in 1/2" and 3/4" pipe sizes, threaded, socketed, or spigot ends, in Geon® PVC and Natural unpigmented virgin polypropylene. Rated to 150 PSI inlet or outlet. Cv rated 2.5 on 1/2" size, 5.0 on 3/4" size. Has minimal space requirements.