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Old 11-17-2002, 09:21 AM   #15
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Oh black water ... keep on rolling .....

Any interesting observation about BLACK and GREY water and keeping it off the ground:

Ever follow a garbage truck on pickup day and seen the foul, ozzzzing, stench ridden, slime, that they are allowed to drip all over our streets?

..... but I guess thats ok? Right?

DMC ..... No grey tank .... on the ground? me? NEVER?!

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Old 11-17-2002, 09:35 AM   #16
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1964 26' Overlander
1978 Argosy Minuet 6.0 Metre
Anna , Illinois
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No Grey Water Tank?????

Greetings Anna!

Prior to 1973, Airstreams did not have gray water tanks. If the rig that you are looking at has the below floor black water tank, it is possible to back-up the gray water into the black water tank by placing a solid terminator cap on the dump valve and opening the dump valve allowing the gray water to back-up into the black tank. (I know the 1960 model Airstreams that I have seen have the black tank above floor level while my '64 has the tank below floor level - - it is my understanding the 1964 was the first year for the below-floor tank for most Airstream models. The down-side to this method is that when you go to dump the contents of the holding tank (first be sure to close the dump valve), there will be about 1/2 gallon of sewage between the now closed dump valve and the terminator cap which must be caught in a pail to be disposed of before the dumping hose is attached. That is why the owner of the rig you are looking at suggested the portable tank - - it isn't the greatest solution going, but it will keep the rig legal in most parks, I have been using a portable blue tank with my Overlander for the past eight years - - choosing one size that will work best for you might be the most difficult decision - - I have two - - one is 20 gallons and the other is 10 gallons and each is on wheels for easier use.

I have considered having a gray water tank added, but it poses the problem of adding additional weight behind the rear axle which isn't terribly desirable. It is also rather expensive when done by the professionals. My Airstream dealer estimated the cost of installation and adaptation to be around $1,200.


Kevin D. Allen
WBCCI (Lifetime Member)/VAC/Free Wheelers #6359
AIR #827
1964 Overlander International/1999 GMC K2500 Suburban (7400 VORTEC/4.11 Differentials)
1978 Argosy Minuet 6.0 Metre/1975 Cadillac Eldorado Convertible (8.2 Liter V8/2.70 Final Drive)
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Old 11-17-2002, 07:33 PM   #17
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1985 27' Sovereign
1981 22' Excella II
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Colbert , Georgia
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Greetings Anna,
I don't know if your tank system is above or below your floor, but if it is below then maybe this will be of some help. My 56 Overlander had a retrofit 20 gal. black water tank with rear drain that was 6" below the bumper....Yes, this was not good because of it scraping the ground often. I replaced the black water tank with a 16 gal. side drain and added a 8 gal. grey water. Both are behind the rear axle. I know the grey water is a bit small, but that was as large as would fit on my unit in the space. I tried to document this project and can be viewed in this forum under gallery photos...Levon. I have used this system and is working fine for me. Hope this helps.


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