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Originally Posted by PizzaChop
...Would like to add gray tank while I'm at it but before I "freelance", it'd be nice to know where Airstream would've put it. I've been told they started in '73 but mine sure doesn't have it (though it looks like it could have). The dump valve is on the street side below the black tank and has two gray drains (1-1/2") feeding from the front and rear. Seems that while it is all exposed, now would be the time to do it....
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Here is a small .jpg from a service manual....the gray tank, in the bay behind the Potable Water tank, is listed as being 13 gallons, the black tank, just behind the grey tank, is listed at being 23 gallons.
Hope this helps.