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WebJun 29, 2024 · Types of Backflow Prevention Devices. Double Check Valves. Reduced Pressure Zones. Pressure Vacuum Breakers. Signs Of a Broken Backflow Valve. Discolored Water. Water Leaks. Slow Drainage. Plumbing Repair & Installation Services. WebThe three most common are the pressure vacuum breaker (PVB), the reduced pressure zone (RPZ), and the double check assembly (DCA). These are all installed in the water system immediately after the isolation valve. There is a fourth backflow preventer which is also fairly common. The atmospheric vacuum breaker (AVB) is installed in each zone of ... WebApr 12, 2024 · This helps you make an informed decision about which product to trust and which to avoid. 1. Sentinel Drain Guard Sewer Backflow Preventer 3" and 4" Backwater Valve - Holmes Approved. 9.5. BUY NOW. Amazon.com. 2. Recommended. Minimprover Internal Backwater Valve,2-F 2" Float Model Flood-Guard for 2-inch Flood Drains,Drain... ios 16 brightness