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Old 09-16-2018, 04:37 AM   #23
JRTJH
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Join Date: Mar 2011
Location: Gaylord
Posts: 26,846
sfsurvivor,

If you have "black tank smells" coming from your shower drain, it's leaking through the HEPV-O valve, but your problem is likely to be in the way you're draining your black tank. There "should" be no communication between the shower drain and the black tank. Essentially, for sewer smells to be emitted through the shower drain, they first have to migrate from the trailer sewer dump fitting (the location where the gray and black tank contents are plumbed to meet) back through the gray tank 1.5" discharge line, through the gray tank, up the shower plumbing, through the HEPV-O valve and into the shower. There "should" be no black tank gas making it that far "up the gray holding tank lines and into the tank" much less from there into the shower pan...

I'd take a look at your dumping process and try closing your gray tank valve, at least for a couple hours after dumping to see if your black tank contents/gas/smell are really backflowing through your gray hold tank system... I'd almost bet it's coming from something else, even if the HEPV-O valve is bad, you should not have any smell from the black tank getting that far backed up on the gray tank side.

ADDED: You might want to consider using a gray tank cleaner for a couple of tanks of gray waste. Sometimes the gray waste water can be "worse on the nose" than black tank waste. Typically, it's the galley that really smells bad, but the bathroom tank can get bad as well. And on many trailers, there's only one gray tank for galley and bath, so they take an extra effort to keep the smells down.
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