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Old 04-16-2021, 05:44 PM   #1
ZephyzWorld
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How to switch which Gray Tank is draining? (Semi Urgent)

My mother and I own a Keystone Challanger fifth wheel. We've been living in it for several months due to our house burning down. All has been well until our kitchen sink refused to drain.

My initial conclusion was that it was clogged. So we plunged it to no avail then we tried rv safe drain cleaner which never went down. Our sink is now filled with about 3 inches of water on both sides.

My mom suggested that the tank was full, but no water drained when I opened the tank. However, when I checked the tanks it said Gray 1 was empty and Gray 2 was full. I always assumed both drained when we opened the tank but it seems like Gray 2 had NEVER been drained and was finally overflowing.

I checked for a valve to switch between the tanks but there was none. Only one valve for Gray and one valve for Black. How do you switch which tank to drain? We've been dealing with this issue for two days now and I'm desperate for an answer...
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Old 04-16-2021, 05:56 PM   #2
gearhead
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There is another dump valve for that tank. Get down on your hands and knees and look all up and down the frame rail.
On a previous trailer of ours the valve handle was back close to the axles pretty much under the kitchen area.
I painted my dump handle orange because sometimes I couldn't see it.
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Old 04-16-2021, 08:54 PM   #3
Gary R.
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On our Alpine, the drain handle for the kitchen sink grey tank is in the water "convenience" center, and one has to pull it straight back to open it.

The water "convenience" center is on the left (sidewalk) side of ours.

Hope you find the valve on your Challenger so you can use the sink again!

Take care!
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Old 04-17-2021, 06:00 AM   #4
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Sorry to hear about your house! That water will be stinky and the pressure through the sewer hose will be higher than usual initially.
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Old 04-17-2021, 06:30 AM   #5
gearhead
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Let us know when you find it, and where it is.
It's there. Sometimes just hard to see.
You're not the first person to ask this question.
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Old 04-17-2021, 07:01 AM   #6
wiredgeorge
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Putting your year, make and model of the camper in a signature would go a long way to help folks answer your question with some context. If the camper is a rear kitchen, the tank is at the rear and dump hand is up under the camper behind the rear wheel on the driver's side. If it isn't a rear kitchen, I don't have a clue but there is another dump handle.
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