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12-03-2022, 12:15 PM
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#1
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New Member
Join Date: Oct 2022
Location: simi valley
Posts: 8
M.O.C. #31809
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Black tank valve replacement
My black tank valve has a internal leak that is letting fluid bypass it. I just need to replaced the valve but I have some questions
Can I just replaced the valve itself?
Do I have to buy the whole cable assembly?
Any recommendations for a better valve?
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12-03-2022, 12:26 PM
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#2
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Montana Master
Join Date: Oct 2012
Location: Box Elder
Posts: 4,776
M.O.C. #12947
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You either have damaged seals or debris in the seals not allowing the blade of the valve to completely close. You can either replace the entire valve or just the seals.
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Bob & Becky
2012 3402RL
2012 Chevy 2500HD D/A CC 4WD
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12-03-2022, 12:36 PM
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#3
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New Member
Join Date: Oct 2022
Location: simi valley
Posts: 8
M.O.C. #31809
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Quote:
Originally Posted by rohrmann
You either have damaged seals or debris in the seals not allowing the blade of the valve to completely close. You can either replace the entire valve or just the seals.
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That's what I thought, but I was wondering if I had to buy the whole assembly with the cable or if I can just by the slide valve by itself.
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12-03-2022, 12:42 PM
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#4
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Montana Master
Join Date: May 2019
Location: Alton
Posts: 2,928
M.O.C. #24086
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Have a look on Amazon. They have a bunch of pictures of the replacement valve and a 360⁰ view you can Pivot around.
YouTube has a lot of videos.
Hope this helps.
Valterra-TC372 Flexible Cable Kit with 3" Valve, Mess-Free Waste Valve for RV's, Campers, Trailers, Black https://a.co/d/5hAC898
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Daryl and Marianne,
2019 3130re 20th Anniversary Edition
2016 F350 Lariat
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12-03-2022, 02:10 PM
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#5
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Montana Master
Join Date: Apr 2017
Location: 1000 oaks
Posts: 980
M.O.C. #19630
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Replace the valve or just the seals, either way you are going to have to completely disassemble the valve and the extension for the cable to do it. Not fun. When I replaced my black tank valve I had to do both valves (black and gray) as they were joined to a single outlet pipe. After reinstalling and testing with clear water I had a leak and had to do it all over again to get it seated correctly. Carry on.
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2011 2955RL Gen-Y Executive Kingpin
2022 GMC 2500HD Duramax/Alison
4X4 Crew Cab/Standard bed.
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12-03-2022, 04:33 PM
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#6
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Montana Master
Join Date: Jan 2018
Location: Granger TX
Posts: 2,680
M.O.C. #21044
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The valve to my front black tank has debris in it (my theory) and it will not close all the way and a little bit of stuff leaks and collects to provide a surprise when removing the hose cap. I need to clean the debris and/or replace the valve. Instead - I bought one of these and installed it on the hose connection. I hook up my hose to this - then pull this valve to drain the black tank. No more surprises.
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MikenDebbie Aggie ‘77 in the sticks near Austin TX
2019 Chevy 3500 High Country DRW
2018 Montana 3921FB
Aussie Gus + Texas Heeler Jimmy
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12-03-2022, 08:11 PM
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#7
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Montana Master
Join Date: Dec 2021
Location: Northeast TX
Posts: 1,017
M.O.C. #30262
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Quote:
Originally Posted by Mikendebbie
The valve to my front black tank has debris in it (my theory) and it will not close all the way and a little bit of stuff leaks and collects to provide a surprise when removing the hose cap. I need to clean the debris and/or replace the valve. Instead - I bought one of these and installed it on the hose connection. I hook up my hose to this - then pull this valve to drain the black tank. No more surprises.
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Whether one has a leaky valve or not, this is one of the best add-ons ever
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Lee, Edith, Lil' Bit & Cuddles
22 MHC 331RL, Surge Guard 35550, SumoSprings, Kodiak disc brakes, 412Ah Lithium, Gen 3 Goosebox, Sailun 85s
22 Ram 3500 CC DRW 6.7 CTD Herrin Hauler Classic Bed, 45 gal AUX tank
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12-04-2022, 03:38 AM
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#8
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Montana Master
Join Date: Apr 2006
Location: Mesa az
Posts: 3,056
M.O.C. #5651
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In addition to this exterior valve, I installed a clear 6 or 8 inch extension that twists on. Since this seems to rotate and or come loose, I put a small screw thru it to sort of permanently keep it attached. So I always shut of this valve when done draining and I can also tell when the black tank water is clear and clean.
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Tom and Gail
2013 Mountaineer 362
2012 Silverado 2500
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12-04-2022, 06:02 AM
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#9
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Montana Master
Join Date: Dec 2007
Location: Kansas City, Missouri
Posts: 2,728
M.O.C. #7992
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Are you sure it is leaking? When I first got mine, I had the same thought. It was just residual water in the drain piping that found its' way to the discharge cap on the ride home. Using something like this is where I'd start.
https://www.campingworld.com/twist-o...lve-27868.html
then a clear elbow like this could help you determine how big the problem is.
https://www.campingworld.com/3quot%3...ter-16835.html
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2006 3000RK
2009 Ram 2500
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12-04-2022, 11:58 AM
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#11
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Montana Master
Join Date: Sep 2013
Location: Pensacola (mail forward service)
Posts: 3,198
M.O.C. #13740
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And you will find the job to be easier if you cut the pipe on the exit side of the valve...leaving enough pipe on the valve for a rubber no hub coupling to reconnect the piping back together.
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2012 F350 6.7 L dually, 2013 3800RE with 6 pt leveling, Sumitomo 17.5" load range h tires, Samsung 18 cu ft residential fridge, 8k Morryde I.S. with disc brakes. Full timing since 2012.
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12-04-2022, 01:15 PM
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#12
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Montana Master
Join Date: Feb 2020
Location: Bencia
Posts: 540
M.O.C. #25828
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Replaced the valve and cable assembly since it would either stick closed or open AND installed an end of pipe valve as a safeguard from a leaky valve.
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2020 Montana 3780RL fifth wheel
2016 F-350 6.7L Diesel Crew Cab Long Bed DRW
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12-07-2022, 01:22 PM
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#13
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Montana Fan
Join Date: Apr 2019
Location: Long Isalnd
Posts: 152
M.O.C. #23929
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Quote:
Originally Posted by Mikendebbie
The valve to my front black tank has debris in it (my theory) and it will not close all the way and a little bit of stuff leaks and collects to provide a surprise when removing the hose cap. I need to clean the debris and/or replace the valve. Instead - I bought one of these and installed it on the hose connection. I hook up my hose to this - then pull this valve to drain the black tank. No more surprises.
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I second this. It seems to be an issue with a lot of RVs. I put in this valve and I no longer have to worry about that mess.
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12-07-2022, 02:09 PM
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#14
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Montana Master
Join Date: Jan 2018
Location: Granger TX
Posts: 2,680
M.O.C. #21044
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Here is a pic of my stuff...
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MikenDebbie Aggie ‘77 in the sticks near Austin TX
2019 Chevy 3500 High Country DRW
2018 Montana 3921FB
Aussie Gus + Texas Heeler Jimmy
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12-08-2022, 09:35 AM
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#15
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Established Member
Join Date: Jun 2017
Location: Burleson
Posts: 32
M.O.C. #19942
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It's really not a hard job to replace these valves. I had to replace one and clean another, but, the best tip I found on this forum was to lower the front of my rig as low as possble before beginning the work. This allows any residual fluids to go to the back of the tank away from the valve. This made for an almost mess free change.
The first time I was going to change the black water valve I bought a valterra valve, but, when I got the old valve out I found it was just full of toilet paper in the groove the valve slides through. I cleaned it out really well and re-installed the valve. Worked perfectly until we traded in a few years later and I still have a spare valve
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Buster and Sandra Foster
Burleson, Texas
2022 Montana 3121RL Legacy
2016 Ford F250 King Ranch CC FX4 with 16k Curt hitch
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12-08-2022, 10:23 AM
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#16
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Montana Master
Join Date: May 2020
Location: UPLAND
Posts: 1,301
M.O.C. #26190
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However it gets repaired, it's still a S@$tty job
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2019 Keystone Montana 3560RL, 2020 Chevy 2500 HD, Firestone airbags, Air Lift wireless compressor, Curt gooseneck, 20K Reese Goosebox, TST-507, USMC combat vet & retired LEO. Robert, Anika, Breanna, Dylan (daughter-in-law Stephanie). & our Great Pyrenees Layla
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12-08-2022, 11:54 AM
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#17
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Established Member
Join Date: Sep 2014
Location: Wenatchee
Posts: 39
M.O.C. #14662
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A contractor once taught me a trick that might work. shut the valve and then fill the tank as full as possible with clean water. Then open the valve just slightly - might have to play with the amount. you want enough water to come through but not too much. with the valve being partially open the water flowing through generates turbulence in the area the gate seals. This can sometimes loosen the offending material and flush it out. This only works if it is indeed is material preventing the gate from closing. Obviously doesn't' work for a damaged valve or seal.
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12-19-2022, 08:43 AM
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#18
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New Member
Join Date: Oct 2022
Location: simi valley
Posts: 8
M.O.C. #31809
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Just an update. The valve I posted above is the correct one, with just a slight modification to the cable connection it will work
Thankfully I took apart the valve and found what appreaed to be some cardboard stuck in the valve. Removed the debris and reassembled. No more leaks keeping the valve for later
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01-27-2024, 12:28 PM
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#19
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New Member
Join Date: Jan 2024
Location: Keenesberg
Posts: 1
M.O.C. #33863
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This is a great idea. I'm getting one ordered this weekend.
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01-27-2024, 02:07 PM
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#20
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Montana Master
Join Date: May 2019
Location: Alton
Posts: 2,928
M.O.C. #24086
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I know this is an old post, but I've been using a Valterra twist on gate valve for years because our black tank valve leaked.
I finally took down the coroplast to fix it. I found the rubber valve seal had been crushed by the sliding gate. I replaced the seals. The factory valves are Bristol valves BTW).
Pretty easy job.
I drilled lubrication holes in the valves and sprayed in some silicon.
This works really good. They pull very smoothly now.
Valve lubrication making lube holes for silicon grease
I also added R23 insulation around the frame perimeter and across the entire bottom before putting the coroplast back up. Hopefully it will help prevent freezing tanks and vlaves.
First picture is the valve with the crushed seal.
The others is the added insulation.
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