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A drain waste vent is used to allow drain water to flow freely by permitting air the enter the system, usually through a vent stack or an air admittance valve. Use with the [plumbing] tag

6 votes
2 answers
3k views

Is my plan for an air admittance valve ok?

I am in the middle of finishing my basement and want to add a sink that will attach to an existing kitchen drain from above. I don't have a way to vent the sink easily unless I use a Air Admittance Va …
Shawn Stephens's user avatar