The Apollo™ Model DC 4A Double Check Valves are designed to prevent contamination of the potable water supply due to back-siphonage or backpressure from substances that are objectionable, but non-health hazards. The modular check valve captured spring cartridges have replaceable seats and reversible silicone seat discs. Apollo™ ball valve shut-offs with stainless steel handles and nuts are standard.
Apollo™, 4ALF107A2F, Backflow Preventer, Standard, Series: DCLF4A, 1-1/2 in Nominal, Non-Rising Stem Flange End Style, 175 psi Pressure, 33 to 140 deg F, Dual Check Backflow, Media: Water, Bronze Body, Domestic