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In answer to your question, yes it's ok to put a vent near your sink, but there should already be a vent from your main stack to your roof. But are you asking if it's ok to have no vent except a vent near the sink? This depends on how far the other fixtures are from the main stack and other questions.


You have one main stack typically. All of the plumbing drains into it and goes down. The venting for the plumbing should be above the highest drain-to-main-stack connection. The venting goes up - on a typical home it would vent out the roof. If you had the vents below then you may get water/sewage in them and your house would stink and possibly drains ...

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