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Old 02-01-2017, 07:02 PM   #1
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1972 27' Overlander
Maple ridge , BC
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Talking Black to Gray tank conversion?

Hello everyone. This site is fantastic and has already been a huge help to my husband and I as we renovate our 1972 27' overlander.
We've just removed both the fresh water tank and the black tank. It would appear that the gray and black were combined as we have been unable to locate a 3rd tank.
I originally thought that the smaller hole was a vent but it seems as though this is the entrance for the gray water and would be vented further along the plumbing line.
We will be installing a composting toilet and have no need for a black tank. We'd like to cap off the black entrance to the tank and use this solely as a gray tank.
Is this possible?
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Thanks for your help
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Old 02-01-2017, 07:23 PM   #2
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Snoqualmie , Washington
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Others with much more knowledge than me will respond, but I don't believe your trailer had a combined gray/black tank. In that era the gray water tank was generally let to drain out onto the ground via a hose away (hopefully) from the camp site.

As far as turning the black water tank into a gray water tank, you can do that but you will need to re-rout your gray water lines to drain into the tank.
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Old 02-01-2017, 07:28 PM   #3
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Check out post #9 by TG Twinkie. As usual, he pretty much nails it.

http://www.airforums.com/forums/f353...art-89791.html
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Old 02-02-2017, 08:54 AM   #4
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For some reason I can't figure out how to edit this post, so, in my first response I said "In that era the gray water tank was generally let to drain out onto the ground", I meant to say "In that era the gray water was generally let to drain onto the ground". Again, I don't think you had a gray water tank

Sorry for the confusing post
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Old 02-02-2017, 09:03 AM   #5
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1972 31' Sovereign
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Airstream didn't start adding grey tanks until midway through '73, so even '73s are hit and miss as to whether they have grey tanks. Black tanks are generally much smaller than grey tanks, so you may find it's not enough for you, depending on your hook up situation (in regards to trailers ). It is possible to add another tank and gang them together to have 2 grey tanks. We added 2 grey tanks ganged together when we rebuilt our trailer. We have the black tank still since we have a flush toilet. Hubby built our tanks.
Good luck!

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Old 02-02-2017, 11:16 AM   #6
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1958 22' Flying Cloud
portola valley , California
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We did exactly this to our '58 '22 FC. We removed the black tank and it is now grey tank and we replaced the frsh water tank with a new fresh water tank. We also added a Nature's head composting toilet. Makes boondocking a lot easier!!
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Old 02-02-2017, 04:00 PM   #7
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1970 25' Tradewind
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Black-gray tank

Simply leave the drain valve closed and the gray water will automatically run into the black tank. When full drain all of it same time by hooking up drain hose and open valve. Good luck Toaster.
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Old 02-02-2017, 07:45 PM   #8
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Maple ridge , BC
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Quote:
Originally Posted by Bob Cooke View Post
Simply leave the drain valve closed and the gray water will automatically run into the black tank. When full drain all of it same time by hooking up drain hose and open valve. Good luck Toaster.
Thanks! We're starting the plumbing from scratch. This may be a stupid question but does the tank need to be vented? Or can we use the smaller opening for the gray input?
Do you have any suggestions on how we can plug the black waste opening?

Thanks again and thanks to everyone for your helpful comments!
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Old 02-03-2017, 05:32 PM   #9
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Yes, grey tanks need to be vented.

Kay
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Old 02-04-2017, 09:05 AM   #10
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Does anyone have any ideas on how we can convert this? Plugging the black hole maybe? But keeping the vent?
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Old 02-05-2017, 10:28 AM   #11
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Originally Posted by Driftin Di View Post
We did exactly this to our '58 '22 FC. We removed the black tank and it is now grey tank and we replaced the frsh water tank with a new fresh water tank. We also added a Nature's head composting toilet. Makes boondocking a lot easier!!
How did you convert the black to grey? Thanks
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Old 02-06-2017, 04:14 PM   #12
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We didn't on ours. Hubby built new tanks from materials he got from a local supplier. Stinky work welding plastic, but he did it out in his workshop. The advantage is that we could build any configuration we wanted. And it was considerably cheaper than buying new for us. He built 2 grey tanks, and 1 black tank. Our original black tank was still good, but we wanted to change the drain hole, and didn't want to try to plug it - iffy at best to do that for leaks. Not to mention, you're working with something full of bacteria (and not real nice bacteria). His technique is in our "Little Girl Refurb" thread under the 1970's section.

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Old 02-06-2017, 05:39 PM   #13
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We use a portable "blue-boy" for grey water when at campgrounds with no sewer.
On a 68, the grey water runs out "downstream" of the dump valve. The only way of using the black tank for grey water is if you have a cap on the fitting where you hook up the "stinky slinky". If you do that, when you dump you will have to close the valve and open the cap to hook up the hose-resulting all the water in the end of the pipe running on to the ground. If you used the toilet it will be a nasty mess.
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Old 02-06-2017, 05:48 PM   #14
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[QUOTE=Minno;1907005]Airstream didn't start adding grey tanks until midway through '73, so even '73s are hit and miss as to whether they have grey tanks.

This is correct as my 73 has no grey tank. I too use a blue boy at campgrounds with no sewer hookups for my grey water.
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