Kitchen sink plumbing help with AAV valve.

[Gio23]

I recently bought a house that didn’t have a kitchen sink. Long story short, bought the house from an investor while they were in the middle of remodeling it.

Anyway, I bought a new farmhouse style sink that is deeper and it hits the AAV valve in the picture so I need to remove it. Can someone help me out and tell me the best way to plumb my new sink?

For some reason I have 2 drains and I don’t know why. I was thinking about just eliminating the top drain and capping it. Then removing the bottom drain and adding a new AAV valve with the p trap. Is it okay to do it like this? Any suggestions would be great.

Thanks in advance!

 

[Geofd]

I'm not sure why the would do this what you can do
is use what they call a "ram bit" it's a PVC drill bit that will
drill the PVC pipe out of the fitting and then you can look inside
the pipe to see there is a Ty in the wall for a vent then you can
repipe the bottom drain could have been for a dish washer
drain never seen it done like that just use that bit to get the pipe/fitting
close to the pipi g close to the wall then repipe

 

[Gio23]

I'm not sure why the would do this what you can do
is use what they call a "ram bit" it's a PVC drill bit that will
drill the PVC pipe out of the fitting and then you can look inside
the pipe to see there is a Ty in the wall for a vent then you can
repipe the bottom drain could have been for a dish washer
drain never seen it done like that just use that bit to get the pipe/fitting
close to the pipi g close to the wall then repipe

Hi Geofd, thanks for the help. There’s no vent behind the wall, I think that’s why it has an AAV valve. I can see everything in the wall from the top because it’s about a 3 foot wall that was cut to the height of the new lower cabinets. (It will be covered by the new counter tops after the cabinets are complete.)

Would I run into any problems if I remove the top drain and use the bottom drain with an AAV? I don’t know if I have any other choice because the current AAV valve is too high for the new sink.

Thanks again for the help.

 

[Geofd]

I would cap off the top one and use the bottom one with
the vent set up as long as piping ion the wall is at least
1 1/2 use a real PVC trap using that bit you could get both
peices of pipe very close to the wall for afresh start

 

[Gio23]

I would cap off the top one and use the bottom one with
the vent set up as long as piping ion the wall is at least
1 1/2 use a real PVC trap using that bit you could get both
peices of pipe very close to the wall for afresh start

Ok thanks for the help. I think I’m going to make it simple and just use the bottom pipe.

 

[havasu]

Just to confirm, you will still use the AAV, correct?

 

[Gio23]

Just to confirm, you will still use the AAV, correct?

Yes, I’m going buy a new one and add it to the bottom pipe. Just going to cap and eliminate the top setup. Is okay to do it this way?

 

[havasu]

Shouldn't be a problem. Just make sure the AAV is above the flood rim of the sink.

 

[Gio23]

Ok thanks again for the advice. I’ll try to post a pic when it’s complete to see if I did it right.

 

[Geofd]

sounds like you have a plan good luck

 

[Gio23]

Finally had the cabinets installed and now I’m getting around to installing the sink. Here’s a picture of what I’m going to do with the plumbing. Let me know if this is okay or if I should change anything. Thanks again for the help.

 

[havasu]

It needs to go higher than that.

 

[Gio23]

It needs to go higher than that.

So I should add a longer pipe between the AAV and the fitting?

 

[TomFOhio]

Yes, it should be a minimum of 4" above the p-trap. I always try to get them as high as possible under the sink so you will be able to unscrew it out and replace it if needed.

 

[Gio23]

Ok, i'll add a longer pipe. Thank you for your help.

 

[Diehard]

Yes, it should be a minimum of 4" above the p-trap. I always try to get them as high as possible under the sink so you will be able to unscrew it out and replace it if needed.

This is a good approach.
Not all jurisdictions or codes require it to be above the flood rim level of the sink, which is pretty tough to do in many cases.