sewer smell in rv

Tinstar wrote:

mtofell1 wrote:

Tinstar wrote:
Most RV toilets have a P trap in them

Huh? Every RV toilet I've ever seen drops straight into the poo lake. This is why there are flappers that seal after you flush and we use chemicals to reduce the smell. RV sinks and tub/showers have P-traps like homes. Home toilets have P-traps built in. RV toilets? Nope, no trap. At least they don't clog :)

I've only had three different RV toilets and seen a few dozen. They all had a P trap. Granted, it's only a small plastic tube and is there as a safety overflow in case the toilet is slowly leaking water into the bowl. When it gets to the top, the water will overflow through the P trap instead of on your floor. If that plastic pipe gets dried up, the smell has a direct route to the inside of your RV. You might want to look at yours again. I believe you may find yours also has it.

What you're describing is not a P-trap. It sounds like an overflow of some type. A drain/waste trap is a slug of water sitting in a cupped section of pipe to stop the smell of sewer from getting into an area. RV toilets don't have them. Sinks and tub/showers do. For the purposes of this thread what you are talking about could be causing an odor but it's not a trap. RV toilets don't have traps.