Bubbling Sink Drain in Bathroom
#6
Our MB has dual sinks.  There are studor vents at both sinks.  The P trap comes into a t in the drain line, the studor vent is about 3" above where the p trap tees in.  Both drains then go down under the house and tie in somewhere in the crawlspace, or at least they go down through the bottom of the cabinet.  I doubt they are tied in between the base of the cabinet  and the floor.   I replaced the faucets yesterday.  I also replaced the drain in the sinks with a pop-up style.   Today while shaving I noticed the drain in the other sink bubbling if I run a lot of water down the drain.  I don't think it's ever done this before.  The differences are the popup drain and the new faucets can put a lot more water down than the old ones did.  So I am wondering if something has always been wrong, but we never noticed because the old faucets didn't put out enough water to fill the drain.  I unscrewed the studor from my sink thinking maybe it was a stuck vent, but it made no difference.

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#7
are you sure the vent is working? Both sinks?
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#8
(08-08-2022, 10:55 AM)Snipe Hunter Wrote: are you sure the vent is working? Both sinks?

Well I unscrewed the studor from my sink, so it was just an open pipe, similar to a roof vent.  it still did the same thing.  I guess I could take both of them off and check it again.

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#9
The studor vent is an air admittance valve to prevent siphoning the trap. It doesn't allow air out; the stack vent should be doing that. The run could be too long for the diameter of the pipe, or most likely, the diameter has been decreased by a partial blockage. There's a long run (26') of 2" from my kitchen sink to the main drain that has has to be cleared about every two years. I installed an end clean-out accessible by removing a piece of vinyl siding and insul. bd. to keep the mess out of the basement. I exchange the plug for a 3' pipe with a male adapter and use a 20' length of PEX connected with a hose to hot water to clear the drain. For a bathroom sink i would just try running scalding hot water for ten minutes or so.
Sign at N.E. Vocational School Cabinetmaking Shop 1976, "Free knowledge given daily... Bring your own container"
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#10
Thanks. That makes sense. I thought the studors let the air out. I took the studor vent off the sink that is bubbling. The sink no longer bubbles and it drains quickly. with the vent on it drains slowly. So maybe there is a blockage there. I will try to snake that line and see what happens. This did not happen until I swapped out the faucets. I am thinking that's because the new faucets allow a lot more water out.

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