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People often wonder where to put a vent pipe in a household plumbing job. The placement depends on the distance of each drain pipe, as anything closer than 3.5-5 inches may require each pipe to have their own vent as opposed to a shared vent depending on pipe diameter. Some places allow a one way vent called an air admittance valve on the drain line, which adequately allows air inside without problematic gas leaks from the sewer.

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