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ZN191-RD-4X18-3IP
one sensing passage o-ring
and relief valve spring
and a heavy duty slotted and knurled adjusting screw
Z627-4NL-Y
Watts 800M4FR-FZ 1 - Part of the 800M4FR Series Geotextile ZN191-RD-4X18-3IPThis 1 inch freeze resistant pressure vacuum breaker backflow preventer helps prevent the reverse flow of polluted water from entering into the potable water supply due to backsiphonage. It consists of bronze body construction, silicone rubber check valve disc, plastic check valve seat, stainless steel springs, a bonnet with silicone rubber O ring seal, a lightweight plastic disc float, a built in relief valve to protect the internal components and
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