Replaced air admittance valve, Still stinks.
Today I replaced the air admittance valves under the kitchen and bathroom sinks. I was getting oder under the sinks while driving. After I took a shower, I noticed the same smell from under the k...
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You may also have a cracked or broken drain line, allowing some gray water to spill out, and when it evaporates, you get the smell. A whitish or grayish residue where it drips or is leaking could be a tell-tale sign. This problem could be under your floor, and very hard to find and fix.
