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Old 05-31-2015, 01:44 PM   #1
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shower to black tank?

Not to steal the thread, have a question about how the shower is plumbed into the black tank on a modern RV. I am dealing with a 1976 MH and noticed yesterday when under it the shower dumps past the shut off so would need hose connected for shower to drain. Is that the way they still do it? The 73 Kit p/u camper we own is plumbed that way however it only has one tank so everything but toilet is past the drain valve. The MH has two tanks, gray tank is in very back of unit so no way for the shower to drain to it. Need to look and see how the bath sink is for sure, I did seal that drain pipe for mice awhile back so pretty sure it dropped into the black tank as it went through the floor. DW and I are planning our first trip in about a week. Not sure if we will use the shower or not.

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Old 06-01-2015, 08:41 AM   #2
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Location: Powell River, B.C.
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Every manufacturer has different plumbing set ups, some even differ between floor plans. Shower draining into black tank would be unusual.
I've had rear kitchen 5ers that had 2 grey tanks, and one with two grey tanks drained the vanity sink into the black; to add more liquid to the tank to promote draining.
About the only way to be sure where the shower drains; if you can't see a connection;, would be to run water in the shower with the black valve open and see if you can feel the water running down the sewer hose. Or buy a clear plastic sewer adaptor.

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Old 06-02-2015, 05:56 AM   #3
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I suspect a previous owner modified the plumbing on your unit. A shower that just dumps directly would be very impractical in any situation but full hook-ups.
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Old 06-02-2015, 06:15 AM   #4
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On our unit the bathroom sink drains into the black tank. Not bad with just the wife and myself, but when company stops by and they think you need 5 gallons of water to wash your hands it does fill the tank faster. It does seem to help with the tank dumps and flushes though.
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