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Old 07-20-2021, 07:54 AM   #1
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Odor in shower drain

I have a 2017 Allegro Bus, 45’. I have an order emitting from my shower drain that smells somewhat like the black tank. I have to keep a stopper over the drain to keep it from going throughout the coach. I have poured treatment in the drain, but it has not helped. Has anyone else experienced this problem, and if so, how do I eliminate it?
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Old 07-20-2021, 08:06 AM   #2
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The grey tank can get a pretty funky smell to it and sometimes nearly as bad as the black tank. But that smell can also come from the "P"traps that can accumulate lots of nasty stuff. As a routine maintenance item, I mix a 10 to 1 ratio of water and household bleach in a 2Qt. plastic pitcher with warm water and pour it down all the drains at night right before we go to bed. That way it can sit there overnight and disinfect the P traps and plumbing. It works every time.

About twice a year I use a stronger bleach/water formula, pour it down the shower drain to make a stronger concentration in the grey tank. Then con't to use the grey tank as normal until it's ready to dump. This in effect gives the grey tank a good washing and disinfecting.
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Old 07-20-2021, 09:14 AM   #3
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First off, Welcome to IRV2!

In the shower drain you have what's called a HEPVO valve instead of a P-trap. Inside is a rubber duckbill that's supposed to allow water to drain and close to keep odors out. If that has become damaged or stuck open with hair, etc it will allow odors to come back from the gray tank. If chemical treatment such as Drano doesn't clear it up, the valve will have to be replaced. DO NOT poke anything down the drain trying to unclog it as that will destroy the duckbill. The valve looks similar to below.
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Old 07-20-2021, 09:29 AM   #4
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Both the above posts are steps to follow as your coach may have a p-trap or a HEPVO valve. Either one can be found in a shower drain. Someone with the same coach may be able to tell us.


Point is, there should be no odor from the drain unless either one of those devices is dirty or faulty.
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Old 07-24-2021, 04:43 PM   #5
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I have a 2017 45OPP and the shower has the exact same problem. I don't see how there is room for a conventional P trap so I assume there is a HPVO valve somewhere. I haven't gone looking for it yet. A large shampoo bottle over the drain helps for now.
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