Watts 757N-OSY 3 - Part of the 757 Series ZA100F-6NH when combined with the SentryPlus

when combined with the SentryPlus Alert® upgrade kit

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This 1/2 inch reduced pressure zone backflow preventer assembly is designed to prevent the flow of polluted water from entering into the potable water supply due to backsiphonage and or backpressure in accordance with national plumbing codes and water authority requirements

the 6 mil thickness provides exceptional durability and tear resistance

PEX union inlet and outlet

Watts 757N-OSY 3 - Part of the 757 Series ZA100F-6NH when combined with the SentryPlusThis 3 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 contaminated water supply due to backsiphonage and or backpressure in accordance with national plumbing codes and contaminated water authority requirements. It is ideal for protection at cross connections identified as non health hazards and from other