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Old 02-20-2012, 06:08 PM   #1
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Black Water Tank Vent Cover Replacement

Can anyone advise me if those aftermarket black water tank vent covers that look like a shark fin work at preventing that smell from coming in the motorhome when driving? Last summer I had to dump every morning before hitting the road even when there was very little afluent in the tank. While they are not expensive they seem to be of moderate difficulty to install what with screwing through the roof and all. I don't understand how that smell can get pulled into the MH through the toilet as I always keep water in it and it seems well sealed. It may come in between the toilet and the floor.

Denis, Ruth and Gracie
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2007 Newmar Baystar 3202
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Old 02-20-2012, 06:31 PM   #2
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Odors travel on the wind and can be drawn into your coach just following the "breeze" down through an open vent. We had this problem, i think many do. I did install a similar device on both the black and grey tank vents. Yes a little modification to the roof to get them to fit properly, but it was not a big problem and that is why they make caulking.

Mine look like Darth Vaders hat but they are low profile white, metal, and powder coated. i got them at an RV show. the bottom line is they work, turn into the prevailing wind and draw the odor off and disperse them. Had them four years.

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Old 02-21-2012, 11:37 AM   #3
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When you travel down the road, especially with a window open, wind can suck odors through leaks around the toilet, up through J traps, the shower drain, etc.

My cure was to remove those rounded covers on the roof and replace them with plumbing 'T's found at nearly anyplace that sells plastic plumbing. The open ends of the T are aligned towards the front and rear of the RV. Caulking was added around the opening in the roof.

With the wind flowing through the T, a negative pressure is caused in the tanks, drawing the odor up and out. Cost about $6 for the two. Even when just sitting in calm weather, they still work better then the factory covers.
'02 Winnebago Journey DL, DSDP, 36' of fun.

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Old 02-21-2012, 08:17 PM   #4
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Thanks for the responses, I will install something to help pull the smell out before my next trip.
Denis, Ruth and Gracie
the K-9 Dashboard Ornament
2007 Newmar Baystar 3202
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Old 02-21-2012, 08:20 PM   #5
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We had the same problem and I installed the "shark fins". It wasn't very difficult and the problem went away so I'm a believer.

Rick, Nancy, Peanut & Lola our Westie Dogs & Bailey the Sheltie.

2007 Itasca Ellipse 40FD
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replacement, tank, vent, water

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