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Old 08-10-2019, 08:45 PM   #21
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No I didn't think of it at the time. But if you can imagine one PVC pipe inside the other, that's what it looks like. I only noticed it on rare occasions and first thought I had a toilet gasket leaking fumes from the black water tank.
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Originally Posted by Golfbum18 View Post
DId you happen to snap any pics while you had the cap off to show what you did??

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Old 08-10-2019, 08:46 PM   #22
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One other item I do not see mentioned. Plugging the bathroom sink while traveling. Many rv bathroom sinks drain into the black tank. If the goose neck drys up from jarring around or drys from evaporation oder can come from the sink drain. I try to remember to put the plug in and add some water above for a good seal.
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Old 08-10-2019, 10:53 PM   #23
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Model: Vegas 25.5
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Originally Posted by Metalman View Post
Over the years we've had problems with black water tank smell at times.
Things that we found to contribute to the smell are:
  • Full black water tank.
  • Back water tank left too long without emptying
  • High ambient temperature
  • Only one application of odor eliminating chemical
  • Driving with the front windows open
  • Bad seal (no water) in the toilet
yep, I had a bad seal in the toilet. I got a polar bear to chase it off.
Sorry Metalman, I just couldn't let that one go by.
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Old 08-10-2019, 10:56 PM   #24
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Old 08-11-2019, 12:19 AM   #25
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Check and see if your roof vent is possibly closing in the heat. I replaced mine me with a 360 siphon. Depending on what year you have they come standard on the new ones.
I use ODORLOSS tank treatment in both black and gray tanks. Absolutely minimal smell even when you have exhaust fan on in bathroom.
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Old 08-11-2019, 12:20 AM   #26
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Originally Posted by pavemike View Post
yep, I had a bad seal in the toilet. I got a polar bear to chase it off.
Sorry Metalman, I just couldn't let that one go by.
Ruff ruff....
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Old 08-11-2019, 12:25 AM   #27
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We had a smell from our shower drain. We didn't use it for a while and the water evaporated out. As we drove the smell came in the RV.
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Old 08-11-2019, 12:55 AM   #28
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Originally Posted by climberbob View Post
We had a smell from our shower drain. We didn't use it for a while and the water evaporated out. As we drove the smell came in the RV.
Perhaps pouring a bit of RV antifreeze in the trap before you store it for long periods of time would slow down the evaporation.
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Old 08-11-2019, 01:00 AM   #29
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Fixed same problem

Valve under bath sink very lose. Thanks!
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Old 08-13-2019, 01:58 AM   #30
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Originally Posted by Miramar Owner View Post
I found my issue was simple to fix...difficult to find. It was suggested by Thor customer service to get on the roof, remove the vent cap and check the space between the vent pipe and the outer tube that contains the pipe. I found there to be no sealant between the two. Occasionally the black tank fumes would flow back down between the 2 pipes and get into the coach. I filled the gap with silicone caulk and have had no further problems.
Should look something like this (my resealing but there should be something). And check the gray tank vent also. That tank can be just as smelly sometimes.
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Old 08-13-2019, 03:57 PM   #31
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Quote:
Originally Posted by Miramar Owner View Post
No I didn't think of it at the time. But if you can imagine one PVC pipe inside the other, that's what it looks like. I only noticed it on rare occasions and first thought I had a toilet gasket leaking fumes from the black water tank.
And you fill the empty space between the two with caulk?
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Old 08-13-2019, 04:10 PM   #32
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The sealant is just to keep water from getting in and under the top plate that goes around the vent.
Any gaps that are underneath that plate: shouldn't matter.
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Old 08-19-2019, 12:57 AM   #33
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My Miramar may be different, but the vent pipe was actally inside the outer pipe you show in the picture. The sealant between the 2 pipes was missing allowing odors to sometimes get into the cavity in the wall. Thor customer service is who pointed this out to me.
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Originally Posted by Bob Denman View Post
The sealant is just to keep water from getting in and under the top plate that goes around the vent.
Any gaps that are underneath that plate: shouldn't matter.
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Old 08-19-2019, 11:01 AM   #34
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Quote:
Originally Posted by CyRE View Post
Valve under bath sink very lose. Thanks!
Glad to hear that you found and fixed it!
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