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Old 02-10-2019, 11:57 PM   #15
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2006 34' Classic S/O
Fort Worth , Texas
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You can use a third valve as mentioned or use an end cap with a hose fitting and screw on a shut off valve with hose threads on each end. That way you can use a smaller grey hose to get ride of your grey/yellow mixture. Remember to cycle your grey and black valves when the are covered with liquid so they wont stick closed from lack of use.
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Old 02-12-2019, 07:13 PM   #16
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1988 32' Excella
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Please realize some 70s AS had above floor black tanks. If this is the case with yours the 3rd valve will not work, water will come up in tub/shower before black tank is 1/4 filled. Also most would remove an above floor black tank to install composting toilet.
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Old 02-12-2019, 09:10 PM   #17
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1976 27' Overlander
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Mine in a below-floor black tank.

I’m still having a hard time visualizing how people recommend using blade valves to link the tanks. I did a search here but not seeing anything with photos. Anyone have any threads they recommend for visual aid?
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Old 02-13-2019, 03:29 PM   #18
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Baltimore , Maryland
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Originally Posted by JoleneAS View Post
Mine in a below-floor black tank.

Iím still having a hard time visualizing how people recommend using blade valves to link the tanks. I did a search here but not seeing anything with photos. Anyone have any threads they recommend for visual aid?
It's pretty simple. You add a valve at your sewer outlet that you can close. You can see mine in the attached picture which is permanently glued on, but Valterra sells a twist on valve for this purpose here:

https://www.amazon.com/Valterra-T58-...dp/B000BGHYJS/

With the waste valve closed, you open both your gray and black tank valves so they empty into the waste manifold. But since there's nowhere for the water to go with the waste valve closed, the water in the two tanks will simply equalize until both tanks are full.

To dump the whole shebang, connect your hose to the waste valve and open the valve.Click image for larger version

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Old 02-13-2019, 03:51 PM   #19
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Note that this valve arrangement will work well IF the black and gray tank are installed at the same level in the frame of the trailer.

Trailers with an elevated black tank, where the toilet sits right on top of the tank will fill the gray tank first, and possibly not fill much of the black tank, or have tank contents come up in the shower drain...connecting the two tanks in this scenario will not gain much tank capacity.
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Old 02-13-2019, 06:07 PM   #20
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Are there any options to interlink the tanks under the subfloor or is that less recommended?
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Old 02-13-2019, 06:20 PM   #21
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Linking the tanks at the dump valve has the great advantage because: 1) It does not require taking the trailer apart to add plumbing and tank ports, and 2) it's easily reversible if you want to go back the other way...
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Old 02-13-2019, 06:26 PM   #22
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Are there any options to interlink the tanks under the subfloor or is that less recommended?
Anything is possible with enough money to throw at the problem. You may recall, I have a composting toilet, so I don't actually have a black tank. I have three gray tanks that can be combined for 44+ gallons of gray capacity.

My two 16 gal auxiliary gray tanks are connected together horizontally inside the belly pan with 1-1/2" ABS pipe, and there is a valve between those two tanks and the dump manifold. Close the dump valve, open both my primary and secondary gray valves, and I can use all my gray capacity. Close all the valves, and only my primary tank (which receives all my gray water) will fill up. This is helpful in the Winter because my primary gray tank is heated but the two secondary tanks are not.

If you do link multiple tanks inside the belly pan, it's worthwhile to think through whether you need extra valves to close them off, and where. For instance, if you have a full gray tank around the middle of your rig and your shower is in the back, what happens if you drive uphill? Maybe you want a valve to close that off to prevent the water from backing up into your shower while you're underway. If one tank is heated and the other is not, it would be worthwhile to have a way to direct waste only to the heated tank.
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Old 02-13-2019, 08:14 PM   #23
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Are there any options to interlink the tanks under the subfloor or is that less recommended?
Did you read my post on the previous page?
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