D-3030G-CFM (Apollo-Conbraco) | 3 Deringer 30 Osy Cfm Dcda-Ii | Lead Free | Flanged X FlangedThis 3 Inch Ames Deringer(Tm) 30G Double Check Detector Type II Backflow Preventer Assembly is Designed to Prevent Non Health Hazard Pollutants From Entering The Potable Water Supply System Caused by Backflow Due to Backpressure And Or Backsiphonage Conditions. Deringer 30G Features Inline Serviceable Os&Y Gate Valves, a Stainless Steel Body, And Dual Action(Tm) Checks For High Performance at Low And High Flow Rates. It May be Installed Under