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Dishwasher Venting and Draining Methods: Air Gap Method-Connecting the drain line to an air gap is one method for installing a dishwasher. In some areas the building codes require that a dishwasher be connected to an air gap installed on the sink.Air gaps are there to keep any contaminants in the drain line from entering the potable water system.ir Gap Method-Connecting the drain line to an air gap is one method for installing a dishwasher. In some areas the building codes require that a dishwasher be connected to an air gap installed on the sink.
Separate Vents. Sometimes, itâs just not feasible to vent only the sink, maybe because a shower or tub is sitting too far away, or maybe because one fixtureâs drainpipe does not connect to the main bathroom drainpipe, which is usually the line running from the commode. When this occurs, an additional vent is necessary. In new construction, the plumber will install a separate vent for any plumbing fixture that does not use the vanity vent. If a fixture has its own vent line, the line will run vertically to the attic and tie into the vent-and-soil stack if possible.