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Smell under sink

My husband installed a new toilet & vanity in our guest bathroom.
There is a foul odor coming from inside the vanity. We can't figure out what the problem is.

Re: Smell under sink

I would guess you have a small leak somewhere. Could be the drain or supply. Look more carefully. Water barely running down a pipe, especially braided plastic flex tubing can be hard to see. If the supply comes up from the floor it can then run below the vanity base and start the subfloor rotting. Hence the stink. Could be a fitting connection leaking.

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