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ZM400SH-2NL
It prevents backflow associated with hose connections when screwed directly to a sill cock
a pour-on gravel binder by Cell-Tek
Features PEX end connections
Watts 757-PIVXOSY 4 - Part of the 757 Series Strip Drian ZM400SH-2NLThis 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
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