Plast-O-Matic Valves” Series PRHM thermoplastic pressure regulator is capable of converting inlet pressures up to 150 PSI to a predetermined maximum downstream pressure ranging from 5 PSI to 125 PSI. Unique to these regulators is the rolling diaphragm seal, which isolates the spring chamber from the downstream pressure sensing liquid and assures sensitive, smooth, accurate performance. Other important features include all-molded body construction, which eliminates internal leakage that could cause a malfunction, and a heavy-duty shaft seat to withstand pressure surges. The new valve also includes a built-in port for a pressure gauge. Regulators are available in ½”, ¾” and 1” pipe size, in Grade 1 Type 1 PVC.