After buying an old house, the kitchen sink didn't drain well, and since it wasn't hooked up to any "stink pipes" I added a Nonavent downstream of the trap, which draws air from above the trap. This worked great, but, after several months the good drainage ceased, and has become even worse than before. I suspect that the Nonavent has for whatever reason stopped working properly after 6 months or so. However, it could be that the vent is not high enough (since it's below the sink), or that the Nonavent doesn't work properly at a 45-degree angle. Any ideas for a better vent product, or better design. Would extending the vent to the top of the sink alleviate the prolem? Thanks.

After buying an old house, the kitchen sink didn't drain well, and since it wasn't hooked up to any "stink pipes" I added a Nonavent downstream of the trap, which draws air from above the trap. This worked great, but, after several months the good drainage ceased, and has become even worse than before. I suspect that the Nonavent has for whatever reason stopped working properly after 6 months or so. However, it could be that the vent is not high enough (since it's below the sink), or that the Nonavent doesn't work properly at a 45-degree angle. Any ideas for a better vent product, or better design. Would extending the vent to the top of the sink alleviate the prolem? Thanks.

I can't pull specs on a "Nonavent" AAV. Who manufactures it? If this is a Studor Vent it must be installed vertically. The height of installation doesn't make any difference since it's a one way valve. Perhaps the drain line needs to be snaked and cleared. Good luck Tom

Hi tom,
Nonavent is the name on the part - that's all I know re manufacturer. It's a simple one-way part with a ~ 1 inch thin rubber inside of the air holes. So, as you suggest, these only work when installed vertically? When I installed it, I didn't think that would matter, assuming that the force of the vaccuum would be much greater than any gravity-related forces. However, if adding an extra 45 will fix it, I'll be on that ASAP.
- Can you confirm that what I have is the Studor vent? Thanks, Jay

hi tom,
Nonavent is the name on the part - that's all I know re manufacturer. It's a simple one-way part with a ~ 1 inch thin rubber inside of the air holes. So, as you suggest, these only work when installed vertically? When I installed it, I didn't think that would matter, assuming that the force of the vaccuum would be much greater than any gravity-related forces. However, if adding an extra 45 will fix it, I'll be on that ASAP.
- Can you confirm that what I have is the Studor vent? thanks, Jay


Good morning Jay,
To see a Studor Vent click on, http://www.studor.com/homeowners.htm
And read the explanations listed at the bottom of the page and then get back to me. Cheers, Tom