[11B]

Finally got to take a look at the venting on my motor home. Found the anti siphon valve behind the washing machine with the cap in place, But I noticed that the drain hose for the washing machine dumps in to a 1 1/2 inch black pipe on the same drain system but there is no cap it just hooks over the edge of the pipe. Couldn't tell if this is the problem but it would stand to reason that with no cap and the fact that it's on the gray water drain line that it could be the stink I'm looking for.

The question I have is do they build a cap for the washer hose to fit in or can I just make my own put it on the drain pipe seal around the drain where the hose fits in and call it a day? Or is there a reason it was left open with no cap.