Facebook cone Icon PNG Transparent Image PNG 0191004 (Ames Deringer) 8 Inch SS Double Check Valve Backflow Preventer Assembly Maxim Osy Shutoff Valves Tri Link Checks. This Maxim 8 Inch Lead Free Double Check Valve Backflow Preventer Assembly is Designed to 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. It is Ideal For Protection at Cross Connections Identified as Non Health Hazards Such as on High Flow Fire Systems And From Other Contaminants Found at The Service Line Entrance. This Compact Modular Design With a Single Access Sleeve For Easy Maintenance is Approved For Horizontal or Vertical Installation in Accordance With The Direction of The Flow Arrow on The Assembly. It Consists of a Stainless Steel Body, Tri Link Check Valves, Outside Stem And Yoke Resilient Seated Gate Valves, And Test Cocks. Ames Deringer 0191004