NRV for Draining 4 Pvc Backflow Valve
Backflow prevention devices are an essential component of any irrigation system. Doug Donahue from Ewing Irrigation A four inch check valve is used to prevent backwater form a public from entering your property. They are supposed to be installed Out with the old and in with the new - Nice little backwater valve swap with @thelittlestplumber using Masters ABS Pro X. ...