Watts 957 DNRS 8 Part of the 957 Series Hanes Geo Specifications Actuation No Assembled Dry Specifications Actuation No Assembled Dry Yes Balance Stop Plate No Ball Material 316 Stainless Steel Body Finish Bronze Body Material Lead Free Copper Silicon Alloy Brand Watts Control Type Lever Handle CV Rating 6 UPC 098268609646 This 8 inch stainless steel reduced pressure zone assembly backflow preventer helps prevent the reverse flow of contaminated water 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 and a corrosive resistant stainless steel bottom mounted pressure relief valve