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04-14-2021, 04:41 AM
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#1
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Junior Member
Brand: Thor Motor Coach
Model: 28Z
State: California
Posts: 9
THOR #22842
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Extra Gray Water Valve
Hello all...total newbie and just took delivery on my used 2020 Four Winds 28z on Sunday. While doing my check out walk through I saw a valve handle under driver side that made no sense. I asked sales woman about it and she said it is extra gray water valve. When asked why she said some models have it and some don't. While I realized the inadequacy of that response I also realized she had no clue. She said my friend (who had just signed on a 28A) did not have that valve.
So now I must task you all with why is this valve there? it is not an actual drain but likely cuts off shower and vanity sink (I know this as first use of vanity it would not drain and after much consternation a fizzing light bulb went of and I kind of remembered the valve). I just do not get the purpose of it if other coach's with same (or similar) configuration do not have it. I hope that one of you wizards can impart some knowledge on this! Thanks!
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04-14-2021, 11:12 AM
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#2
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Senior Member
Brand: Thor Motor Coach
Model: Quantum JM31
State: Tennessee
Posts: 697
THOR #21926
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Quote:
Originally Posted by Lawgeek
Hello all...total newbie and just took delivery on my used 2020 Four Winds 28z on Sunday. While doing my check out walk through I saw a valve handle under driver side that made no sense. I asked sales woman about it and she said it is extra gray water valve. When asked why she said some models have it and some don't. While I realized the inadequacy of that response I also realized she had no clue. She said my friend (who had just signed on a 28A) did not have that valve.
So now I must task you all with why is this valve there? it is not an actual drain but likely cuts off shower and vanity sink (I know this as first use of vanity it would not drain and after much consternation a fizzing light bulb went of and I kind of remembered the valve). I just do not get the purpose of it if other coach's with same (or similar) configuration do not have it. I hope that one of you wizards can impart some knowledge on this! Thanks!
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Just a wild guess but maybe the floor plan necessitated two smaller gray tanks instead of one larger gray tank.
Bob
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04-14-2021, 11:41 AM
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#3
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Senior Member
Brand: Thor Motor Coach
Model: 2020 Magnitude SV34
State: Florida
Posts: 4,148
THOR #12751
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Go to the Owners Resource site and register. You will then be able to downlaod the schematics for your coach.
https://www.thormotorcoach.com/owners/
Without pictures it is hard to help but I will throw this out there...... I had an Outlaw 29H and it had two black tank valves. The black tank was on the paseenger side and the grey tank was on the drivers side. I think there were two reasons for two valves.
The blank tank drain plumbing ran under the drive shaft and over to the grey tank where they merged for draining. There was a valve right at the bottom of the tank and then one on the drivers side for draining. The valve at the tank being closed kept debris from filling the plumbing and potentially clogging. It also allowed the blank tank to be closed if the plumbing got ripped off the bottom of the coach. It was about 6" off thr ground at best.
I ended up removing the black tank drain that went under the drive shft and added a drain for it on the passenger side as a result because I knew some day a speed bump or debris in the road would tear it off.
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04-14-2021, 12:02 PM
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#4
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I Think We're Lost!
Brand: Still Looking
Model: Tiffin Wayfarer 24 BW
State: New York
Posts: 22,195
THOR #8860
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I was thinking the same thing... but this extra valve is on the driver's side...
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"What: me worry?"
Good Sam Member 843599689
Current coach: Tiffin Wayfarer 24 BW
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04-14-2021, 01:41 PM
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#5
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Site Team
Brand: Thor Motor Coach
Model: ACE 27.1
State: Florida
Posts: 14,324
THOR #7035
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Where, on the driver's side, would this "extra" valve be?
I can see, with your floor plan, that the black tank is likely under the passenger side and probably has an isolation valve there in addition to the black and grey isolation valves on the driver's side used for dumping. I can see no use for an extra grey isolation valve on either side of the coach.
EDIT: Further research shows a single grey water isolation valve directly below the grey water tank.
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Ted & Melinda
2016 ACE 27.1
2016 Chevy Sonic Toad - Selling
2020 Chevy Colorado Z71 Trail Runner Toad
2024 Chevrolet Trax 2RS - Soon 2B TOAD
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04-14-2021, 01:43 PM
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#6
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Senior Member
Brand: Thor Motor Coach
Model: A.C.E. 27.2
State: Indiana
Posts: 1,874
THOR #14698
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I think Judge has your answer.
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2018 ACE 27.2
Toad 2019 Jeep Cherokee Trailhawk
Roadmaster Falcon All Terrain Towbar
Roadmaster Invisibrake
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04-14-2021, 02:20 PM
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#7
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I Think We're Lost!
Brand: Still Looking
Model: Tiffin Wayfarer 24 BW
State: New York
Posts: 22,195
THOR #8860
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Quote:
Originally Posted by MJC62
I think Judge has your answer.
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If we assume that the O.P. just got the side of the RV a bit confused: I agree.
That does seem like a setup that could use the extra Blackwater tank valve.
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"What: me worry?"
Good Sam Member 843599689
Current coach: Tiffin Wayfarer 24 BW
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04-15-2021, 05:09 AM
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#8
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Junior Member
Brand: Thor Motor Coach
Model: 28Z
State: California
Posts: 9
THOR #22842
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My Bad
OP got the wrong side lol. Dump valves are on driver's side. This valve is on passenger side below the head. I wonder if it is to prevent back flow from tank into shower during transit? The shower is a low point that may be close to same height of tank. Assuming there is not a check valve at tank, this would help prevent back flow??? Sounds plausible to me but I really know very little lol.
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04-15-2021, 10:36 AM
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#9
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I Think We're Lost!
Brand: Still Looking
Model: Tiffin Wayfarer 24 BW
State: New York
Posts: 22,195
THOR #8860
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No problem...
We have decided that valve is sort of an "emergency prevention procedure".
Since the cross-tube rides so low across the underbelly of the RV: It would keep the tank from being drained unexpectadly; should that tube get busted.
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04-15-2021, 02:32 PM
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#10
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Site Team
Brand: Thor Motor Coach
Model: ACE 27.1
State: Florida
Posts: 14,324
THOR #7035
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Quote:
Originally Posted by Lawgeek
OP got the wrong side lol. Dump valves are on driver's side. This valve is on passenger side below the head. I wonder if it is to prevent back flow from tank into shower during transit? The shower is a low point that may be close to same height of tank. Assuming there is not a check valve at tank, this would help prevent back flow??? Sounds plausible to me but I really know very little lol.
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It has nothing to do with the shower. It is a BLACK tank isolation valve, not grey tank isolation valve.
__________________
Ted & Melinda
2016 ACE 27.1
2016 Chevy Sonic Toad - Selling
2020 Chevy Colorado Z71 Trail Runner Toad
2024 Chevrolet Trax 2RS - Soon 2B TOAD
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04-16-2021, 02:57 PM
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#11
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Junior Member
Brand: Thor Motor Coach
Model: 28Z
State: California
Posts: 9
THOR #22842
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Thank you all
Thanks for the thoughts and opinions. I reviewed the schematic and it does show a valve right at the BW tank. It makes total sense that this would be a backup to prevent draining the tank should one break the low lying pipe. I thought it was gray water as it seemed like it was a small valve, but I really did not get a good look. I'll confirm later today when I pick rig up from storage.
I really have to give props to Thor for the online resources. I actually signed up and put my VIN in the day I put a deposit down on the rig. It is nice having every manual and schematic at your fingertips!
I appreciate you all for indulging and tolerating my newbyness! I am sure I will have many more questions to come and may even end up in the "they sell these things to anyone nowadays" category! Thanks!
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04-16-2021, 06:14 PM
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#12
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Senior Member
Brand: Thor Motor Coach
Model: A.C.E. 27.2
State: Indiana
Posts: 1,874
THOR #14698
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" Newbyness" got to ad that to the RV data base
__________________
2018 ACE 27.2
Toad 2019 Jeep Cherokee Trailhawk
Roadmaster Falcon All Terrain Towbar
Roadmaster Invisibrake
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04-17-2021, 02:09 PM
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#13
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Senior Member
Brand: Thor Motor Coach
Model: 2019 Chateau 28Z
State: Tennessee
Posts: 487
THOR #22388
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I have the Chateau 28Z. On the drivers side there are 2 valves, Small one is grey and the other larger one is Black. Now on the passenger side there is another Valve for the same black tank. It's there just in case the black water line that goes under the drive shaft gets hit, the waste water does not spill out on the ground. I ALWAYS keep that one off while driving. I also keep it off when camping. I use it as (Extra room) so when the black tank gets full I open the valve on the passenger side and I get more room as it fills the long pipe up. That said, I have been in some areas with limited ground clearance and have not had any problems. I do keep a rubber coupling just in case to make repairs. But I also keep a couple sections of PEX, fittings and crimper just in case. (was a Boy Scout Leader)
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2019 Thor Chateau 28Z 2018 E-450 Chassis W/ V10
4 Wheel tow a 2021 Ford Ranger Lariat 4X4 W/ Blue Ox Alpha Tow Bar/Base Plate and Stay-IN-Play DUO Brake system.
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04-17-2021, 02:49 PM
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#14
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Senior Member
Brand: Thor Motor Coach
Model: 2019 Chateau 28Z
State: Tennessee
Posts: 487
THOR #22388
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Here are ALL the Diagrams for the 28Z.
See page 17.
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2019 Thor Chateau 28Z 2018 E-450 Chassis W/ V10
4 Wheel tow a 2021 Ford Ranger Lariat 4X4 W/ Blue Ox Alpha Tow Bar/Base Plate and Stay-IN-Play DUO Brake system.
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04-17-2021, 02:58 PM
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#15
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Senior Member
Brand: Thor Motor Coach
Model: 2019 Chateau 28Z
State: Tennessee
Posts: 487
THOR #22388
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__________________
2019 Thor Chateau 28Z 2018 E-450 Chassis W/ V10
4 Wheel tow a 2021 Ford Ranger Lariat 4X4 W/ Blue Ox Alpha Tow Bar/Base Plate and Stay-IN-Play DUO Brake system.
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04-19-2021, 04:32 AM
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#16
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Junior Member
Brand: Thor Motor Coach
Model: 28Z
State: California
Posts: 9
THOR #22842
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Quote:
Originally Posted by CHS
I have the Chateau 28Z. On the drivers side there are 2 valves, Small one is grey and the other larger one is Black. Now on the passenger side there is another Valve for the same black tank. It's there just in case the black water line that goes under the drive shaft gets hit, the waste water does not spill out on the ground. I ALWAYS keep that one off while driving. I also keep it off when camping. I use it as (Extra room) so when the black tank gets full I open the valve on the passenger side and I get more room as it fills the long pipe up. That said, I have been in some areas with limited ground clearance and have not had any problems. I do keep a rubber coupling just in case to make repairs. But I also keep a couple sections of PEX, fittings and crimper just in case. (was a Boy Scout Leader)
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Thanks CHS! Great idea to carry a coupler or two just in case. I will do that.
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04-20-2021, 12:38 AM
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#17
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Senior Member
Brand: Thor Motor Coach
Model: 2016 Siesta Sprinter 24ST
State: Florida
Posts: 604
THOR #2812
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Another discussion on that crossover black tank drain, mentioned: valve at tank was to keep crossover empty in cold weather. A full, frozen crossover could be a problem.
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U.S. Coast Guard retired- 1956-1985
Pensacola, Florida
2016 Siesta 24ST
1972 Moto Guzzi Eldorado
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04-20-2021, 01:04 AM
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#18
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I Think We're Lost!
Brand: Still Looking
Model: Tiffin Wayfarer 24 BW
State: New York
Posts: 22,195
THOR #8860
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And messy: if it cracks open...
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04-20-2021, 02:42 AM
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#19
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Senior Member
Brand: Thor Motor Coach
Model: Forest River Forester 235
State: Indiana
Posts: 4,884
THOR #6826
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I was told the “extra” valve was there because the “solids” in the black tank will settle to the low point and you want them to remain in the tank instead of possibly packing the pipe full of disgusting ick.
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04-21-2021, 06:20 PM
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#20
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Junior Member
Brand: Thor Motor Coach
Model: Four Winds Hurricane 30Q
State: Washington
Posts: 5
THOR #21688
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Weight of “Ick”
Quote:
Originally Posted by Pete'sMH
I was told the “extra” valve was there because the “solids” in the black tank will settle to the low point and you want them to remain in the tank instead of possibly packing the pipe full of disgusting ick.
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That’s why I keep that valve closed until it’s dump time. That “ick” could add a lot of weight to the piping crossing over to the dump side. Our 2000 Hurricane has a 4” crossover from the black tank, routed around the gas tank to the dump valve. If I leave the “extra” valve open on the passenger side, it will fill with “ick”y liquid to the tune of about 80 lbs of weight. That just adds to the aggravation if it settles and clogs.
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