Backflow Preventers & Vacuum Breakers in Commercial Kitchens: What Code Requires

Backflow prevention exists to stop contaminated water — from a spray hose, a dishwasher, or any equipment where water could siphon backward under a pressure drop — from being pulled back into the building's potable water supply. Most commercial kitchen plumbing codes require a certified backflow-prevention device on specific connection points, and inspectors check for it specifically, not just a functioning faucet.

Backflow preventer vs. vacuum breaker vs. check valve

• Backflow preventer— the general category of device that stops reverse flow. “ASSE 1022” is a certification standard specifically for hose-connection and dishwasher-type backflow preventers common in commercial kitchens.
• Vacuum breaker — a specific backflow-prevention method that admits air the instant pressure drops, breaking the siphon before contaminated water can be pulled backward. Common on pre-rinse spray valves and hose bibbs.
• Plain check valve — only allows flow in one direction under normal pressure, but most check valves alone are notcode-compliant backflow protection — they aren't certified or tested the way an ASSE-listed device is.

Where these are required in a commercial kitchen

The most common code-driven locations are pre-rinse spray units at the dish pit, hose-connection points (mop sinks, wash-down hoses), and dishwasher water supply lines. Local plumbing code (often based on the Uniform or International Plumbing Code) and your health department are the final word on exactly which fixtures require which device — when in doubt, match what was originally installed or ask your plumbing inspector.

How to tell if yours needs replacing

• Visible corrosion, cracking, or mineral buildup on the device body.
• Water dripping continuously from the vent/bleed port, even when the fixture is off.
• It failed a required annual backflow-device inspection or test (common in many jurisdictions for larger devices).

Not sure which device you need?

Email a photo of your existing fitting and its connection point (hose bibb, pre-rinse unit, dishwasher line, etc.) to info@prokitchenspares.com and we'll help confirm a code-compliant replacement — see also our FAQ.