Quote:
Originally Posted by jlonginav
There is a standard P Trap. The fumes are at their worst under the sink. I did see some areas around the PVC going down into the tank and out the side wall that can be filled in with foam sealer
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I'm not sure I understand what you are talking about. It sounds like you are saying the vent for the kitchen sink drain line is going out the side of the trailer? That doesn't sound right. If it's not plumbed in to the roof vent then you should have an air admittance valve under the sink as mentioned above.
Here's a picture of mine. The air admittance valve is that little stub against the wall. Sorry the picture is rotated wrong. The valve just screws in and might be loose or maybe it's missing. Easy to replace.