What is a loop vent.
Posted by John Gardner on March 20, 19101 at 18:51:05:
I've heard that an option for venting a sink drain is a loop vent. What is it and how do I make one? I have a sink in my garage which has a room on top. I didn't plan the location of the sink to take into account the vent. Now I have a fairly long run to get around the room.

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