Backflow Preventer Size Calculator
Size from Flow Rate
Determine backflow preventer size based on peak flow
Formula
Size based on peak flow capacity tables per ASSE/AWWA standards
Frequently Asked Questions
What is a backflow preventer?
A backflow preventer stops contaminated water from flowing backward into the clean water supply. Required by code at connections to fire systems, irrigation, boilers, and other cross-connections.
RPZ vs DCVA?
RPZ assemblies provide the highest protection and are required for high-hazard connections. DCVA is used for low-hazard applications. RPZ has higher pressure loss than DCVA.
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