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Old 06-27-2008, 07:45 AM   #1
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Question Adding gray water tank to a 1971 25'

Is it possible to add a gray water tank to a 1971 25' and where would it go? What year did A/S start providing grey water tanks?

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Old 06-27-2008, 07:52 AM   #2
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Yes you can add one with some work. 1974 was the first year for gray tanks in Airstreams. Uwe had an early 70's Trade Wind that he added a gray tank to.
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Old 06-27-2008, 09:26 AM   #3
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I did, indeed.
It goes in the frame space immediately behind the rear axle.
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Old 06-27-2008, 10:04 AM   #4
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Uwe, do you have any photos showing the process?
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Old 06-27-2008, 11:25 AM   #5
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Quote:
Originally Posted by cameront120 View Post
Uwe, do you have any photos showing the process?
Sorry, I do not. I was on a PC back then, and when it went, it took out my photos.
I did a rear floor replacement at the same time.
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Old 06-27-2008, 11:37 AM   #6
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Sorry, I do not. I was on a PC back then, and when it went, it took out my photos.
I did a rear floor replacement at the same time.
That's a shame.
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Old 06-27-2008, 12:57 PM   #7
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Quote:
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That's a shame.
Indeed.
However, I do remember doing the job. It really wasn't very difficult.
The hardest part is always finding a suitable tank. One that has the drain connection at the right stpot and fits well into the frame space.
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Old 06-27-2008, 01:19 PM   #8
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I suppose one could make a tank out sheet stainless. That might actually be easier than finding one ready made that meets a particular trailers requirements.
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Old 06-27-2008, 01:53 PM   #9
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I suppose one could make a tank out sheet stainless. That might actually be easier than finding one ready made that meets a particular trailers requirements.
After you drop some belly pan and measure what you need...

Ordering a new tank will be easier than you think:

example - - Plastic-Mart -

try googling Custom RV Waste Tanks
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Old 06-27-2008, 02:07 PM   #10
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I considered adding a gray tank to mine but I felt it would be too difficult to reroute all the drain plumbing. On my present factory setup everything drains to the rear. I would have to completely redesign it to drain to the center then somehow route the tank drain back to the rear or street side. I may regret it later but decided it wasn't worth the hasle IMHO. I'll just have to hope that I will be able to use the old blue tanks.
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Old 06-27-2008, 03:18 PM   #11
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I'd do it now, while you've got a blank slate. I've found over the years that there are occasionally camping opportunities at places that aren't campgrounds. Sometimes, even at some campgrounds, the dump station is SO very far away, its a royal pita to get a blueboy over there. If you can, you have to wait in line twice. And where no dump station exists, (highway rest stop/walmart/crackerbarrel, etc), a small blueboy has little utility...and a big one is too heavy to lift into the truck. It would just be so much easier to be completely self-contained.
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Old 06-27-2008, 08:05 PM   #12
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I have a 70 23ft safari that I am going to put a tank in. I was going to try a tank from a newer Airstream. Maybe a 75 or 76 and see how the factroy did it. There can't be a lot of difference in the way they are put together. Mine is a single axle.
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Old 07-01-2008, 07:00 PM   #13
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Grey tank in '71 25 footer

Quote:
Originally Posted by paul903 View Post
Is it possible to add a gray water tank to a 1971 25' and where would it go? What year did A/S start providing grey water tanks?

Thanks
Hi Paul - my situation exactly, and I'm coming up with the same answers as others who responded - "put it behind the axle." Check out INCA Plastics. They make a 26 gallon tank that looks right, but I'm not ready to pull the trigger. Tonight, I'll post the specific tank #, some thoughts on why it looks right, and other work I'm doing in the area. jim
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Old 07-01-2008, 08:40 PM   #14
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I found a very nice tank for the Globetrotter at Ronco plastics in Tustin CA.
www.ronco-plastics.com

Their Holding tank catalog has some tanks that will fit into the frame recess, with just enough protrusion to make a nice new dump valve system.
Grey tanks need to be vented at or near the top, so that they can fill completely without forming an air bubble above the liquid. The fill pipe can go into the tank's lower section, or even connect to the drain line. With the 1.5in valve closed, the tank will fill so long that it is vented at the top.
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