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Old 01-27-2020, 01:49 PM   #1
2 Rivet Member
 
2005 28' Safari
Decatur , GA Georgia
Join Date: Aug 2017
Posts: 23
stinky black tank

Working my through fixing a stinky black tank / toilet
Did several tank cleanings now looking for other items and leaks.
Want to remove the toilet and look for cracked pipes then replace the flange seal. Does anyone know if Thetrord uses a universal flange seal? My toilet is a Thetford 31653 and appears to use a 33239 flange seal but on the mfg web site their is no info on flange seal number.

Next step if I can not find a cracked pipe or leak is to replace the roof vent with a 360 Siphon vent. Anyone have experience with this vent working well to remove sewer smell? Thank you.
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Old 01-28-2020, 01:00 AM   #2
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2012 25' FB Eddie Bauer
Vintage Kin Owner
Virginia Beach , Virginia
Join Date: Sep 2004
Posts: 6,939
Your profile says you have 3 trailers, so the solution may depend on which one has the problem. One member with an almost new trailer removed the wall panel to inspect his vent pipe and... it was missing! Smells sort of wafted upward but every flush injected nastiness into the trailer. Seems the vent pipe may possibly simply rest over a hole in the top of the black tank and sometimes the pipe falls into the bottom of the black tank where it can't vent at all. If the vent pipe is in place and intact, it can still be clogged by mud dauber nests, etc. Before major surgery try running a small sewer snake down the pipe for a simple free fix.

Cleaning the tank with a toilet wand inserted through the flush valve is more effective than any flush system Airstream ever installed. Old ones were made of copper, newer ones are plastic, and the cap on the end can fly off while in the first use. Make your own or use PVC pipe glue to secure the end cap before use.

Check the condition of the floor surrounding the toilet, too. Calcium buildup on the black rubber seal can cause water to slowly leak leaving a dry bowl. Using "Lime Away" 3 times just let me delay the (gag, retch) job of replacing the black seal. I know I may have only bought a short reprieve but Whew, worth it. When I do have to put in a new ring I will rinse and refill the tank 3 times, using bleach, Calgon and Dawn detergent first.

Last, the flapper itself can be too worn to hold water even with a new seal, so consider getting a new toilet too.
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