Bob(not a plumber)
New Member
I am doing a little basement renovation involving a little bit of plumbing for a friend. His basement has a suite in it. This was added in long after the house was built. Part of the renovation we are doing is moving the laundry from one room to an adjacent room. When I pulled the washer outlet hose out of the drain, raw sewage gas filled the air, GROSS. I pulled of the wall paneling to see a 2 inch line coming off a horizontal drain on a 45 degree elbow stubbed out of the wall. No trap. I cut the line back in the wall, and added a 2" to 1 1/2" reducer, a trap and a drain running up the other wall for the relocation. Now the drain sucks air through the trap when any thing downstream in the suite is draining. You can here it bubbling in the trap. Obviously there are no vents in the suite, and it was using the washer drain as a vent. The next fixture downstream from the washer is a kitchen sink. Would it help to put an AAV under the cabinet between the wall and the p trap? I can see down the back of the wall from the laundry. The drain runs vertically from the washer all of the way down the wall with the kitchen sink teed off of it, and then it disappears at the far wall. There is no drop from the sink, to the drain, and no vents to be seen.