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The low pressure range is 10 to 35 psi (69 to 241 kPa) with the standard setting at 50 psi (345 kPa)
It has an atmospheric port that provides visual indication of failure of the second check and a Wye pattern strainer
Specifications Buy American Act Compliant NO Kit Type Flange Accessory Kit Lead Free YES Product Group BACKFLOW KITS UPC - 098268489347
it effectively blocks sediment
Watts 957Z-NRS-FS 4 - Part of the 957 Series Sheet Drain The low pressure range isThis 4 inch reduced pressure zone assembly backflow preventer help stop the reverse flow of liquids due to backpressure or backsiphonage, where potential health hazard exists. This extremely compact and lighter than a traditional designed assembly is approved for horizontal Z pattern installation as long as the backflow assembly is installed in accordance with the direction of the flow arrow. This assembly consists of a stainless steel body with a
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