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Old 04-20-2025, 01:07 PM   #1
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1970 27' Overlander
Bisbee , Arizona
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70 Overlander waste system?

Hello—new owner of a 1970 27' Overlander. I'm trying to figure out the waste system, and the owner's manual doesn't answer a couple of questions. We're going to have the trailer parked next to our house construction to live in while I finish the building, and the waste line from the trailer will be connected directly to our septic system. I understand that there is no gray water tank in the trailer and that sink and shower water goes straight to the exit. But does waste from the toilet have to first go through the black water tank, or can it exit directly as well? Also, there are two waste exits, one under the left side of the trailer and one in the bumper compartment. Which one do I use?

Thanks for any guidance!

Jonathan
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Old 04-20-2025, 04:48 PM   #2
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1970 27' Overlander
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The two waste exits:


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Old 04-20-2025, 08:07 PM   #3
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RE: 70 Overlander Waste System?

Greetings Jonathan!

Welcome to the Forums and the world of Vintage Airstream ownership!

Quote:
Originally Posted by JonathanH View Post
Hello—new owner of a 1970 27' Overlander. I'm trying to figure out the waste system, and the owner's manual doesn't answer a couple of questions. We're going to have the trailer parked next to our house construction to live in while I finish the building, and the waste line from the trailer will be connected directly to our septic system. I understand that there is no gray water tank in the trailer and that sink and shower water goes straight to the exit. But does waste from the toilet have to first go through the black water tank, or can it exit directly as well? Also, there are two waste exits, one under the left side of the trailer and one in the bumper compartment. Which one do I use?

Thanks for any guidance!

Jonathan
I am nearly certain that the waste water plumbing on your Overlander has been modified. I would speculate that the waste drain at the rear bumper is the factory black water tank drain. I suspect that the one that is on the side of the trailer is most likely for a gray water tank that was added by a previous owner. The question with the gray water tank, if that is what it is, is whether it collects the water from the bathtub/shower as it appears to be awkwardly located in relation to the probable location of that drain.

When it comes to operating the black water side, you want to allow the black water tank fill to between 75% and 80% full before dumping -- otherwise, you will end up with an accumulation of solid waste in the bottom of the black water tank that is difficult to nearly impossible to remove. The gray water, however, at your discretion, could be allowed to drain into the septic continually without significant problem to your plumbing system, although you may notice sewer gasses coming into the trailer depending upon how this aftermarket tank was installed if it is left open at all times.

Good luck with your investigation!

Kevin

P.S.: I lived in my 1964 Overlander Land Yacht International for over 5 months while I was awaiting posession of a home that I purchased during a very tight housing market in 2000. I followed the black water tank dumping routine that I outlined above for that entire time -- I was in a full-hookup campground.

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Old 04-20-2025, 10:07 PM   #4
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1970 27' Overlander
Bisbee , Arizona
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Kevin,

Thank you for the welcome and the advice! I'm happy to hear I wasn't just being stupid not understanding the extra waste drain. I suppose one way for me to confirm is to uncap it and start running water through the galley sink and bathroom taps. It is in a strange location if it accepts flow from the rear bathroom. I'll report on what I find.

Thanks also for the advice on the black water tank. Will do.
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Old 04-21-2025, 08:58 AM   #5
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1972 31' Sovereign
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I agree with Kevin, it looks modified. In our '72, we had no grey tank originally, and the grey "tank" water drained directly out the same dump pipe that the black tank dumped out of. The black tank had a valve. The bathroom sink might have been rerouted during that modification that appears to have been done to drain into the black tank instead of the grey. Something else to investigate. We did that when we added our grey tank, to reduce the amount of fluid going into the grey tank, and increase the black tank "fluid" to make dumping easier.

Definitely let the black tank fill before dumping! Volcanos in black tanks are never fun... And pay attention to the toilet paper you use if you put it into your tank. Make sure it breaks apart easily in water before you put it in your tank.

Good luck!


Kay
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Old 04-21-2025, 04:46 PM   #6
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1970 27' Overlander
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Thanks for the extra information Kay! I will do all I can to avoid that volcano . . .
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