My mom's Kitchen sink was plumbed by a plumber but never has been right.... if you run water, there is no need to plug the sink it will back up and drain slow. If ypu.pour down the right drain it comes up in the left and vice versa and then drains. I have measured the pipe slope 3/4 over the 18 inches. I am also questioning the 90 immediately following the P trap. That seems like it would be an opportunity for water to fall back.... pipe is 1 1/2 " . Here are some.pictures... any guidance is
Double Sink witt AAV slow drain and backs up into other drain
- Thread starter SJEruck
- Start date
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The drain is clogged up. You need to clean the drain with a drain cable.
Or you could try plunging it. Fill the left side bowl 1/2 way up with warm water.
Put the stopper in the right hand side and have someone hold it in place.
Now pull the left side stopper with the water in it and start plunging after it stops draining.,
Keep the right side bowl stopper held tightly in place.
Good lucky
Or you could try plunging it. Fill the left side bowl 1/2 way up with warm water.
Put the stopper in the right hand side and have someone hold it in place.
Now pull the left side stopper with the water in it and start plunging after it stops draining.,
Keep the right side bowl stopper held tightly in place.
Good lucky
There is nothing wrong with this piping. That p-trap is going into a tee, not an elbow. Run a snake through
the drain line clear to the main as suggested. Also you can try to plunge it but be careful as to much pressure
will cause leaks on your fittings underneath the sink.
the drain line clear to the main as suggested. Also you can try to plunge it but be careful as to much pressure
will cause leaks on your fittings underneath the sink.
JG plumbing
Well-Known Member
You may want to take the trap assembly apart. Clean the parts. Replace the compression washers. While it's apart clean the outlet tee with a rod. Unscrew the aav and check it. Those can and do go bad. Maybe he got some glue in the aav and it never worked right.
AAV’s don’t stop a sink from draining.
It stops it from breaking the trap seal.
So it can’t be the AAV. STraps drain fine don’t they ?
JG plumbing
Well-Known Member
They do if they don't admit air. It really depends a lot on piping, but they can. I don't really know why you think you know things when you're wrong alot. Lol
Thanks for the reply, immediately after the p trap is a 90 and it seems to me the water would run into it and backup
Attachments
The AAV valve seems to be working because there is water in the p trap , or am I incorrect
JG plumbing
Well-Known Member
I would go with my first suggestion.
Im wrong a lot ?
.If S traps don’t drain then how does a toilet flush ?
have fun with that.
He doesn’t understand that the AAV protects the trap, it’s not to help it drain.
Maybe that page in his book is missing, I don’t know.
JG plumbing
Well-Known Member
He doesn’t understand that the AAV protects the trap, it’s not to help it drain.
Maybe that page in his book is missing, I don’t know.
I think you need to do some experiments.
I already have, plus trade school and 36 yrs of on the job experience.
It doesn't look like a p-trap arm but isn't that part of your p-trap. Get a new tubular trap assembly and you
won't have that high arm.
Jeff Handy
Pro Handyman, NOT A Pro Plumber
In my experience, an aav WILL help a single bowl sink drain faster, with an S trap.
With double bowls, there is less benefit.
JG plumbing
Well-Known Member
In trade school we had a mock bathroom with glass piping. You could plug and fill different portions of the piping and fill sinks and bathtubs and pull plugs and mix and match. We could shoot water all over the system by pluging and unplugging vents or letting air flow only one way through a vent you could see the system slow way down. Over sized traps would leave gunk behind. Aavs are a bandaid and effect different situations differently.
Or you could just say you know and you have experience.
Or you could just say you know and you have experience.
lack of one will not stop the flow. That’s the point.
It drains fine without the AAV, they were developed to protect the trap seal.
We did that as well in trade school. We had different than results than you.
I also have closed vents on homes in use and ran tests.
I’ve worked in homes that didn’t have vents AT ALL and it all drained fine.
I don’t know what else to tell you ? AAV’s are not designed to make the sink drain. S-traps drain fine, they just tend to siphon.
I Set up a sink a few weeks ago for the forum to prove a KSink will drain with a vent with an STrap. Worked just like I said it would.
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JG plumbing
Well-Known Member
Of course they will. You don't need any vents to drain. If you look I said it changes the dynamics. It's pretty easy to think about. I don't know how you could argue different. Without vents traps siphon. Water slows. Things plug. If you suddenly introduce air to a system that's pulled a vacuum things go where they shouldn't. Either your not reading carefully or hazing the argument. Which seems to be common for you.
JG plumbing
Well-Known Member
I used to work with a guy that insisted on using sand as bedding and backfill. He used to tell me "I've been doing it for 40 years". No matter how much sand bedded pipe we had to replace (becuse the flow was slow and they plugged up all of the time due to sags), he still insisted on sand. Even when I showed him it was against code.
Stuff works, not optimally. Then it doesn't work.
Stuff works, not optimally. Then it doesn't work.
