The Watts 9BD Backflow Preventer is a critical safety component for commercial beverage systems. Featuring 3/8" Male Flare (MFL) connections, this valve is designed to prevent the reverse flow of carbonated water or syrup into the potable water supply, protecting against contamination and copper leaching. The 9BD series is engineered for high-pressure systems and features an atmospheric vent to signal seal failure. Essential for maintaining compliance with local health and plumbing codes in soda fountain and carbonated water installations.