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07-15-2022, 08:18 PM #1
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Is it possible to install bigger grey water tanks?
I have a 2022 Momentum 351 MS and they say it has 78 gallon capacity for grey water. But on our first trip we filled the main grey on the first day. So I called Grand Design Customer Service and they said it’s actually split between the half bath and the main area. So I only get 39 gallons for the main and 39 gallons for the half bath which hardly gets used. I am wondering if anyone knows if it’s possible to have a bigger grey tank added? Or if it’s even worth the hassle?
Thanks!
- Tony
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07-15-2022, 08:21 PM #2
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One thing a lot of us do is install a Valterra gate valve at the sewer outlet, close the black tank, close the Valterra valve, and leave both gray tanks open. This effectively couples the two gray tanks together.
RobU.S. Army Retired
2012 F350 DRW CC LB Lariat PS 6.7
2020 Solitude 310GK-R, MORryde IS, disc brakes,
Sailun LRG tires, solar, DP windows, W/D
(Previously in a Reflection 337RLS)
Full time since 08/2015
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07-15-2022, 08:36 PM #3
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07-15-2022, 08:40 PM #4
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My underbelly has room for slightly larger tanks of all types. However weight balance and frame strength issues make me very cautious. The benefits of another 10-15 gallons has me looking at 'blue boys' for 20-35 gallons instead.
Rick
2019 Reflection 150 273MK
2015 Ford F350 CC SB Lariat Powerstroke
PullRite Superglide
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07-15-2022, 08:45 PM #5
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- Jul 2021
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Not hard, but it, as usual, depends on the application. I put this one, https://www.valterra.com/product/twi...e-valve-boxed/, on the end of my black tank drain because the OEM valve never seemed to shut off completely. I had the clear elbow, but that only shows you what's there, not how to deal with it.
Check around for prices, I bought mine off Ebay for $8, most places are around $14.Howard and Peggy
2019 Momentum 351M, and 2018 RAM Cummins dually 6-speed.
His: 1999 Honda Interceptor
Hers: 2013 Spyder ST-S
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07-15-2022, 08:56 PM #6
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07-16-2022, 11:14 AM #7
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07-16-2022, 01:13 PM #82021 398M Full Body Paint 8k axles. LRH tires. Disc brakes.
Two bathrooms, no waiting 155 fresh, 104 black, 104 grey 1860 watts solar.
800AH BattleBorn Batteries No campgrounds 100% boondocking
2020 Silverado High Country 3500 dually crewcab Duramax Allison
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07-17-2022, 09:45 PM #9
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07-18-2022, 03:33 AM #10
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2022 367BHS Reflection 5th wheel ...
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