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Bubbling Sink Drain in Bathroom - crokett™ - 08-08-2022
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.
RE: Bubbling Sink Drain in Bathroom - Snipe Hunter - 08-08-2022
are you sure the vent is working? Both sinks?
RE: Bubbling Sink Drain in Bathroom - crokett™ - 08-08-2022
(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.
RE: Bubbling Sink Drain in Bathroom - MstrCarpenter - 08-08-2022
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.
RE: Bubbling Sink Drain in Bathroom - crokett™ - 08-09-2022
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.