MasterSeries 850 In-Line design double check valve assembly backflow preventers are designed to prevent the backflow of pollutants that are objectionable but not toxic, from entering into the potable water supply. They feature an epoxy coated ductile iron body and NRS resilient wedge gate valves. Optional OSY RW gate valves are available. Maximum working pressure is 175 psi (12.1 bar).
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