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Old 04-16-2018, 02:09 AM   #1
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Gray water tanks advice

Our 2018340 RL has two gray water tanks but tank 1 only connects to bathroom sink while shower and kitchen connect to tank 2. Looking at the pipes it appears to be an easy mod to connect the shower to the bathroom sink drain pipe thus “sharing” the tanks capacity between both tanks. Anyone done this or heard about it? Not sure designed the tank system but it would take us all summer to fill tank 1 with water from bathroom sink.
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Old 04-16-2018, 06:27 AM   #2
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Most of us add a Valterra Gate valve on the end of the sewer outlet. Then you can close that and open both grey valves and the tanks will self-equalize. Works like a champ.
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Old 04-16-2018, 07:12 PM   #3
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We have done the same as Vaughn described above and it works great on our gray tanks.


https://www.amazon.com/Valterra-T58-...rra+gate+valve
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Old 04-16-2018, 09:43 PM   #4
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Thanks for the advice. Picked one up this morning in Page and will see how it works.
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Old 04-17-2018, 12:22 AM   #5
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I have the Wastemaster Cam lock system. I swear someone on here once had a link for a valve that would work at the drainpipe end for this system. I would like to install a valve without attaching the hose. The idea behind this is that when boon docking in the mountains I want to do the two holding tank thing then hook the hose up later when getting to the dump.

If someone has found a cam-lock valve without doing a cam-lock/twist-lock adapter then the valve I would appreciate the link. I thought it was at Drainmaster but could not find it.
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Old 04-17-2018, 01:27 AM   #6
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Larry, I don't have the Cam Lock system, but I actually cut the main drain line where it exits from the Drop Frame section and installed a valve there and don't have to worry that an external one might come off during travel. Works for me, especially since I have a Galley valve that doesn't always close all the way.
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Old 04-17-2018, 04:10 PM   #7
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Quote:
Originally Posted by mhs4771 View Post
Larry, I don't have the Cam Lock system, but I actually cut the main drain line where it exits from the Drop Frame section and installed a valve there and don't have to worry that an external one might come off during travel. Works for me, especially since I have a Galley valve that doesn't always close all the way.
That makes total sense! After reading several other posts related to this, I think most of us have the 3 cups of grey water drainage issue when opening the cap. Your solution would take care of both issues at the same time.

The only other thing would be to test the system to see if I am actually able to use both holding tanks first. Having the 31SL could be different.

Thanks so much for the alternative idea!
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Old 04-17-2018, 04:34 PM   #8
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I know it's different on the MB, as our Gray tank is in the drop frame section, while the Galley is above the axles so our Galley would tend to flow into the Gray filling it first.
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Old 04-19-2018, 02:08 AM   #9
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I installed the Valterra gate valve; opened both gray tank valves and voila, the two tanks equalized. Excellent advice form the veterans out there. Much appreciated!
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Old 06-05-2018, 05:04 AM   #10
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Any pictures or videos on this system change?
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