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The installation of an air gap and drain line are recommended on reduced pressure zone assemblies
ZN191-RD-4X18-3IP
and a heavy duty slotted and knurled adjusting screw
one sensing passage o-ring
and relief valve spring
Watts 800M4FR-FZ 1 - Part of the 800M4FR Series Geotextile The installation of an airThis 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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