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and 2 check rubbers
The standard outlet is a no-hub type
one diaphragm plate o-ring
This 8 inch butterfly valve is designed specifically for applications which may require an NSF approved valve for potable water system applications
ZB400E-4IE
Watts 757N-OSY 3 - Part of the 757 Series Pipe Connection Fitting and 2 check rubbersThis 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
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