Series PR/PRH/PRHM Downstream pressure reducing valve features large area rolling diaphragm, ultra-smooth operation and isolated spring control. Molded and machined valves in 1/4” through 3” (for 4” consult factory) and metric pipe sizes in popular thermoplastic materials with a wide range of connection types. Proven design provides highest flow with minimal pressure droop. While some valves may be limited by size or material, most models provide set range of 10-125 PSI. ¼” through 3” PRH/M models in PVC and CPVC are WQA certified NSF/ANSI-61 and NSF/ANSI-372.