My dishwasher is in an island, across from the sink. If I connect my dishwasher directly to the sewer line instead of to a garbage disposal, then does it still need an air gap?
Plumbing – Is air gap needed if dishwasher is connected directly to the sewer line
dishwasherplumbing
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Best Answer
You do need an air-gap. In my state it is legally required (Cal Plumbing Code 414.3)
Contrary to what you might mistakenly interpret from some other comments, it does not serve the same function as your sewer/drain vent system. It is not a "vent", it is a vacuum breaker.