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Old 09-09-2015, 02:11 PM   #15
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1990 29' Excella
Corner Brook , Newfoundland
Join Date: Oct 2014
Posts: 10
Roof vent is my guess as well as right next to bathroom fan. Our 1990 29' Excella had a bad smell in the bathroom. Thought vent pipe was apart so removed metal cover and cabinet. All O.K. They had a massive hole cut in floor for the pipe. I filled it with foam and smell disappeared. Never noticed any leaks so may be where vent enters tank. Harvey

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Old 09-09-2015, 02:35 PM   #16
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2011 27 FB International
Tucson , Arizona
Join Date: Apr 2014
Posts: 145
Some of the solutions seem dramatic. Have you checked the AAV (air admittance valve) under the sink? It's a $5.00 part. If it's stuck you will suck grey water tank air into your trailer when you run the fan. AS part number 60538,Vent, V200 Automatic. Available at any plumbing supply store and many Ace or big box hardware stores.

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Old 09-09-2015, 03:42 PM   #17
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2011 27 FB International
Tucson , Arizona
Join Date: Apr 2014
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PS: It's also known as a 'Studor Valve." Here it is on Amazon:

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