All Backflow Preventers Home » Products » BEECO (Backflow Valves) » Backflow Preventers Mifab backflow preventers are designed to prevent non-health hazard pollutants from entering the potable water supply system. 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FRP-RUBBER-KIT Repair Kit: Backflow Preventers Old Style FDC Basic Repair Kit Old Style FDC Model 2 and DDC 11 Model Basic Repair Kit Old Style FRP11 Rubber Repair Kit PRV-RV-KIT Repair Kit: Backflow Preventers (Relief Valve Only) RPDA (2 ½”-10″) Reduced Pressure Zone Backflow Detector Assembly Rubber Repair Kit FRP #6CM Bronze Design Rubber Repair Kit FRP #6CM Cast Iron Design Rubber Repair Kit FRP 6C Bronze Design Rubber Repair Kit FRP 6C Cast Iron Design SP Spools and Spaces (2 ½”-10″)