This 3/8 inch dual check vacuum breaker backflow preventer is designed for vending machine water supply lines to prevent the reverse flow of contaminates, such as carbon dioxide gas and carbonated water, from entering the potable water supply. It consists of a stainless steel body construction, rubber parts, dual check valves, ball check valve, flare end connection, and an atmospheric vent. It is designed for continuous pressure applications and complies with FDA food additive regulations. The maximum working pressure is 150 psi (10.3 bar).