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Built-in check valves prevent hot and cold water cross flow
part of the NDS Profile Series™ Channel
It is easily opened for gravity circulation
Features Epoxy coated cast iron body
The double throttling design controls both hot and cold water supply to the mixed outlet
Watts 757-OSY-FXG 4 - Part of the 757 Series Z100F-8NH Built-in check valves prevent hotThis 4 inch lead free double check valve backflow preventer assembly is designed to prevent the reverse flow of 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 hazards and from other contaminants found at the service line