Possible broken pipe above the grey tank?

[vocoder]

I posted this in the low-traffic, model-specific forum the other day and realized it may be better here.

I have a '14 Stealth SS1913 toy-hauler and was dry camping this weekend when I noticed a horrible odor in the bathroom. Not a typical 'black tank' smell, but equally unpleasant.

The smell hit me HARD when I opened the cabinet door under the sink. I noticed that the low point drains have a sealing compound around them at the floor in that cabinet, but the sink drain doesn't. All drain pipe fittings are secure from the sink to the floor, so I'm wondering if there's a crack between the floor and the top of the tank that is letting the odor seep up around that unsealed drain hole?

Has anyone had something like this happen to them? How'd you fix it?

[B and B]

Is there a air admittance valve in the cupboard? I had one that was stuck that stunk to high heaven.

[Dave_Monica]

They look like this and are installed after the U drain...

Dave

[vocoder]

Yes, I have one of those. Is it repairable, or should I start looking for a replacement?

[Dave_Monica]

Need to replace it...available at any hardware/plumbing supply outlet.

Dave

[vocoder]

Thanks!