Deringer 20G-OSY 4" Double Check Valve
Details
Details
Deringer 20G is designed to prevent non-health hazard pollutants from entering the potable water supply system caused by backpressure and/or backsiphonage. Deringer 20G has OSY valves along with dual-action checks.
Manufacturer: Deringer
Size: 4 Inch
Product model: 20 / 20G
Size: 4 Inch
Product model: 20 / 20G
Maintenance Manual Deringer 20G 2 1/2" - 4" Spec Sheet Deringer 20G 
How to Maintenance a 2 ½" - 4" Deringer 20 Double Check Backflow Preventer