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4 inch Watts Model 77F-DI-250
2-inches high
This 12 inch full lug style butterfly valve
The configuration includes a robust heavy-duty frame with anchor tabs and co-plane straps for secure alignment
Prevents backflow of sewer gas into building
Watts 774-OSY 12 - Part of the 774 Series ZA100F-8NH 4 inch Watts Model 77F-DI-250This 12 inch lead free double check valve backflow preventer assembly is designed to prevent the reverse flow of contaminated water of non potable quality from being pumped or siphoned into the potable water supply due to backsiphonage and or backpressure in accordance with national plumbing codes and water authority requirements. It is ideal for protection at cross connections identified as non health hazard applications and from other contaminants
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