Air Admittance Valve
I took the valve off and turned it upside down and filled it with water as explained. No water came out, so I assume that the valve is ok. I drained the grey water and the smell went away as it should have. I will monitor this for a week and see how it goes. The vent that uses the wind to suck the smelly fumes looks like a nice feature for venting on the move. Thanks again to all who have contributed.
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