I have a Itasca 35f class a that has the 2 bathrooms. The bath that is mid coach has a urine smell that we cant get rid of. This smell floats up through the cabin and is also in the compartment where ...
There is a rubber coupler between the valve and the macerator held on with a hose clamp. Due to vibration the rubber coupler slips down and allows liquids to leak into the compartment when the valve is opened. We found out the hard way when dumping one time and ended up with a compartment full of nasty stuff. The marine grade carpet tends to soak up some of this and continues to emit a nasty odor until cleaned.