The Champion 100500 Dishwasher Vacuum Breaker is a safety device crucial for commercial dishwashers. It prevents contaminated water from flowing back into the clean water supply. This brass vacuum breaker with a 1/2" FPT connection utilizes atmospheric pressure to automatically close a valve, stopping the siphon effect that can occur when water pressure in the dishwasher drops. https://partsfe.com/100500-champion-breaker-vacuum-12