Watts 9BD 3/8" Dual Check Vacuum Breaker

Watts 9BD 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. The vacuum breaker has a stainless steel body construction, rubber parts, dual check valves, ball check valve, flare end connection, and an atmospheric vent.