Watts 957N-QT 4 - Part of the 957 Series R304 Detectable Warning Surfaces 4 inch Watts Model 77F-CSI

4 inch Watts Model 77F-CSI

Check O-ring Kit Type First Check Kit Lead Free YES Product Group BACKFLOW KITS UPC - 098268796285

This 2 1/2 inch stainless steel reduced pressure zone assembly backflow preventer help stop the reverse flow of liquids due to backpressure or backsiphonage

ZB400B-2IG

and radiators

Watts 957N-QT 4 - Part of the 957 Series R304 Detectable Warning Surfaces 4 inch Watts Model 77F-CSIThis 4 inch reduced pressure zone assembly backflow preventer helps prevent the reverse flow of fire protection substances and water of non potable quality from being pumped or siphoned into the potable water supply due to backsiphonage and or backpressure in accordance with national plumbing codes and water authority requirements. This extremely compact and lighter than a traditional designed assembly is approved for horizontal N pattern installation