Ames D-3020 Double Check Valve Backflow Preventer

Ames Deringer 20 D-3020 is a 3 in nominal stainless steel double check valve backflow preventer assembly that protects the potable water supply from backflow caused by backpressure or backsiphonage. The grooved-end, lead-free 304 stainless steel body features integral butterfly shutoffs, dual-action check modules, and test cocks for field testing, all in a compact package measuring approximately 18.7 in L × 11 in W × 10.3 in H. Rated for 10–175 psi and 33–140°F, this unit is designed for commercial and industrial potable water systems where reliable backflow prevention is required. Applications include cross-connection control in building service lines and other non-health hazard pollutant protection scenarios.