Sewer vent smell - need advice

mrkoje wrote:
I am having an issue with sewer odors in my trailer. They seem the strongest around the toilet. I've done some research on here and I think I've narrowed it down to the rooftop vent for the black tank.

Can someone please give me some advice on how I should or could repair this vent. The pictures below are for comparison between the rooftop vent for the gray tank (which looks normal to me) and the broken or incorrectly installed rooftop vent for the black tank.

Here is a picture of the gray tank rooftop vent:

Gray tank (normal looking vent)

Here is a picture of the problem black tank vent. It may be hard to see from the picture but the black hose/pipe that should be above the roofline is approximately 3" below the roofline. It also seems that the vent cover is broken because there is a larger hole here.

Black tank vent (broken or not installed correctly)

Any advice would be appreciated on the repair. I think I will be replacing the cover with one of those 360 degree siphon types that I've read about.

I haven't taken the entire vent cover assembly out yet because of the weather today. I don't have a replacement yet and I didn't want to leave it off over the night.

This is only a suggestion, make sure that your ( P ) traps in your sink and shower has water in them. Especially, in the bathroom also close the bathroom vent closest to the sewer vent pipe. We made a trip and were almost driven out of our RV by the odor from the sewer tanks.

Good luck have a safe trip.