1

We're using an AAV for our island drain, but before I can attach it the pipe coming out of the slab is not vertical. How do I fix that?

Additional Information:

I haven't attempted to measure how far out of plumb it is, but I don't believe it's enough that even the smallest standard fitting will do the trick. I've considered either heat and bend or cut and install a flex coupling. The AAVs I've read about are looking for a five degree tolerance if I'm not mistaken.

Michael Karas
  • 63,732
  • 7
  • 60
  • 141
user162327
  • 11
  • 1

2 Answers2

3

Standard drain pipe elbows (or "bends") are available in (at least) 15, 22.5, 30, 45, 60 and 90 degree bends. You may not find all those at a "box store" but online or at a plumbing supply they can be had. 11.25 degrees is also made, I find.

With due care & caution, you can also heat PVC plumbing and bend it - but due care is required so as not to kink it, overheat it, or otherwise cause damage. Fittings are harder to screw up, and can likely get you close enough to vertical that it won't matter.

As to your assertion that "even the smallest standard fitting would not do it" that would be unlikely:

  • If it's less than 5 degrees, it's within tolerance.
  • If it's more than 5 degrees, and less than 6.25 degrees, you'd be right, though there's enough slop in the fit up that you could be wrong by applying pressure correctly when gluing.
  • If it's more than 6.25 degrees, then an 11.25 degree bend will get you within tolerance.

So you have 1.25 degrees where that could be true. If it's more than 13 degrees, you use a 15 degree bend, etc...

Or there's @Isherwood's solution if you want perfect, rather than within tolerance.

Ecnerwal
  • 174,759
  • 9
  • 212
  • 440
3

Two elbows.

Install two low-angle elbows and adjust them as needed. The combination will allow for any angle. You can even implement an offset to adjust position if needed.

isherwood
  • 119,766
  • 7
  • 148
  • 349