The RPCV Series PVC Double Union Check Valve is designed and manufactured for use in piping systems where a possibility of back-siphoning exists, primarily from an upper pool level to a lower pool elevation.  They are installed on display and filter piping systems. The RPCV Series is of PVC schedule 80 full port construction with EPDM ‘O’ rings, a stainless steel compression spring,  and slip or threaded end connections. Spring cracking pressure is 1 PSI. The valve is available in six (6) sizes ranging from 3/4″ to 3″.   Please refer to the cut sheet for additional technical data. Documentation & Downloads 3.716 RPCV Series PVC Double Union Check Valve- Roman Fountains Cad File DWG | 4 MB 3.716 RPCV Series PVC Double Union Check Valve- Roman Fountains Cut Sheet PDF | 149 KB