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Old 03-24-2014, 05:26 PM   #1
Rivet Master

1971 31' Sovereign
1972 31' Sovereign
1983 31' Airstream310
Soddy Daisy , Tennessee
Join Date: Sep 2013
Posts: 633
Covert fresh water tank to a gray tank

Does anyone know if their is a thread about taking the old fresh water tank 31 gallon and converting it to a gray water tank and mounting it just behind the axle on my 72 31' Sovereign or has anyone successfully done this retrofit. Hate to waste a good tank.
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Old 03-25-2014, 03:58 PM   #2
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If it is under the floor why not leave it alone and route the gray water to it and use a long slinky.? What would you do for fresh water? Jim
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Old 03-25-2014, 07:26 PM   #3
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1973 21' Globetrotter
Houston , Texas
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Seems like I have seen a thread or two where folks consider using a "retired" fresh water tank for a grey tank--don't recall that the entire thread was started for that purpose.

The problem with doing so is that you lose the cross member that originally goes in the center of the tank. If you follow the "best practices," you will try to locate your grey tank as close to the axle as possible. As a result, you already have a missing full cross member where the fresh tank is installed, and then you will lose another one, one cross member back. You end up with a length of about 8' of frame rail with only one cross member in the middle, and one at each end.

Good luck!
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Old 03-25-2014, 07:31 PM   #4
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Another question I failed to ask, is how is it that you are replacing your FW tank, when it is still in good enough shape to hold water? Is it just funky inside? If so, I would suggst that instead of buying a brand new FW tank, buy a couple of grey tanks that you can use without removing entire cross members, and just clean that funky FW tank out. Yes, they are hard to clean. I installed a marine "deck port" in the top of my FW tank so that I can give it a much mor thorough clean out. Might be an option for you.

good luck!
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