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Old 05-03-2021, 09:14 AM   #1
2 Rivet Member
vashon , Washington
Join Date: Sep 2019
Posts: 26
Septic Puzzle to Solve...


Have a 1968er. The shower will drain directly to the outside outlet but won't go into the black tank. Any ideas why?

Any help would be appreciated.

Thank you!
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Old 05-03-2021, 09:20 AM   #2
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2002 25' Safari
Dewey , Arizona
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Shower water is gray water not back water. Airstream made before 1974 had no gray tank and the water flowed out the exit pipe. You can use a tote to collect the water or have a gray installed. If you replumbed and used the black tank for gray water, it would fill very quickly.


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Old 05-03-2021, 09:51 AM   #3
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1964 17' Bambi II
1961 24' Tradewind
Strasburg , Pennsylvania
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Yes, you have a pre-gray tank Airstream. Dumping gray (sink/shower) water on the ground was fine then, but is frowned upon now. But it is dish soap and regular soap, and a few food scraps, perhaps. When was the last time anyone got excited about anyone else washing their car and letting that soap run and enter the ground? But I digress.

As mentioned, you can use a portable tote (blue boy) to cart away your gray water to the dump station, or add a subfloor tank. I added a tank to my '64, and have my tank made for my '61. I utilized my resources and had my tanks tig welded from aluminum...but many aftermarket plastic tanks in various sizes can be custom ordered from suppliers on the internet.

And one other thing about combining the gray/black tanks. Not only would the tank fill up quickly, but if you ever overfilled and had some backflow into the lowest point (usually the tub drain), you would only ever want that to be gray water. Never black water.
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Old 05-03-2021, 09:54 PM   #4
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vashon , Washington
Join Date: Sep 2019
Posts: 26
Black Tank Mystery...

Richard and Pa Bambi -

Thank you for your replies. So new issue...

The toilet was removed. So the sink and the shower drain into the black tank. So I lifted the door thing to empty the black tank and when I did that, the shower and sink drained into the black tank. Isn't that odd?

When I got the water to fill the black tank I decided to test its limits. I ran water until it started to come up the tub. It would to a point. Looked outside and saw water gushing out the back of the airstream.

Since I don't plan to put a toilet in (going dry flush if they ever send it to me) - is it possible to replace the original black tank with a grey water tank from underneath the airstream so I don't have to rip out the bathroom?

Thank you for your thoughts and help. I truly appreciate it.
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Old 05-03-2021, 10:47 PM   #5
2 Rivet Member
vashon , Washington
Join Date: Sep 2019
Posts: 26
may have solved it...

We had the floors redone. I asked the guy to plug the toilet hole as were were going "dry flush." So I'm thinking maybe it wasn't plugged or the plug came out when I filled the tank to capacity.

Still what doesn't make sense to me is why when I open the waste valve does the sink/shower water enter the black tank. I thought the waste valve opens the black tank to be drained. So very confused by this.
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Old 05-04-2021, 01:57 AM   #6
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Hilltop Lakes , Texas
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The gray water outlet is plumbed into your trailer's drain line downstream of the black tank dump valve. You must have a cap over the outlet for what you describe to be happening.
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