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I'm replacing my double kitchen sink and replacing an S trap with a P trap. There is no vent nearby that I can tie into easily, so I'm going with an under sink AAV. Issue is, I don't have much space between the current s trap and where the drain ties into (through the floor):
I ran out of parts, but my idea is to use 90 degree elbows to circle back to the drain in the floor, and use another 90 pointed down or a j bend to get it into the drain.
Can I Change The Original 2 Sided Kitchen Sink Plumbing Using A T Connection To Drain Both Through The Same Down Pipe And Free Up Space In The Cabinet?
The sanitary tee will sit on the straight drain pipe going down through the bottom of the cabinet, it will accept the pipe coming from the trap. Depending on space you may not need to take such a circuitous route to get the trap outlet into the san tee. (
Meaning you may not need the 90 elbow going into the san tee, the trap swivels and you can cut the pipes to try and make a straight run to the san tee
For the AAV you can come off the top of the san tee and then 90 over to the side of the cabinet and then 90 up so the AAV can go up between the side or back of the bowl and the cabinet (
Two Ways To Plumb An Island Sink
It needs to be a high as possible. Put a threaded connection just after the 90 that turns up so you can pull it out if you need to change or service the AAV in the future.
Here's how I decided to plumb the traps. A straight 1ft section of 1 1/2 PVC was enough to get the AAV above the height of the strainer baskets. And I have enough room to get in there in the future. Had to get creative with making a double male union to join both female slip joints together where the santee meets the existing drain pipe, but it should hold up fine.
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