Daughter bought a older home that had the kitchen remodeled.
The kitchen sink does not have a direct vent to the roof but uses one of the
pressure valves type devices.
The device is under the kitchen sink in a corner of the cabinet against the
very back wall.
Now here's the strange part.
There is what appears to be a yellow plastic sticking out of the pipe.

It's like they put a plastic bag over the pipe and then shoved the vent
device over the plastic.

Unfortunately there is no way to run a real pipe vent up through the walls
and out the roof.
I could drill a hole through the 12" brick wall to the outside but that's a
street/sidewalk side wall and would look terrible.

So before I take this apart...anybody have an idea what the problem is.
(I do understand the principal of venting and the vacuum created by water
running down the drain)

Also, a possible contributing factor.
The sink drain has the LONGEST tail piece I've ever seen. It makes the P
trap assembly extremely deep reaching almost to the bottom of the sink
cabinet before it goes back up and then horizontal into the drain. It's got
to hold more water than any P trap I've seen in a residential installation.

Please help, the smell is bad and you waste a lot of water running in the
sink to remove the smell.
Although the smell could be coming from the laundry sinks in the basement
directly below.

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The quartermaster has only two sizes, too large and too small.
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Bill H. in Chicagoland
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