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  • #16
    Jumping in here on this. About a year ago I bought a Bristol gate valve for the large shower gray tank. Was dealing with the limited space to remove and replace. Found that there is a bracket that can be loosened and spun so the tank can be slid to gain a larger space to reinstall the new valve and sealing rings a lot more easily. However, with the fitting in the neck of the tank it became quite unsealed. After talking to a mobile repair tech I have used in Kerrville, TX I bought Flex Seal in the can and a roll of Flex Seal tape. This combination sealed and has worked for at least a year.

    Now comes the request for wisdom. All three of the gate valves work harder than Hades. Removing the coroplast I found a small phillips screw that joined the cable and valve on the shower tank. Reinstalling this the valve does move, but hard. I recall Rob installing grease fittings. I am hoping that someone can relate a positive experience with Thetford's liquid, or vegetable oil, or ANY solution. Thanks all!
    2020 Solitude 2930RL S-Class

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    • #17
      steve gravelle
      Hi Steve,

      My "grease fitting" gate valves continue to work well with a couple of pumps of grease a couple of times per year. Of course . . . this requires access to the gate valves (which I have with my opening doors in the coroplast). It has been suggested that tubes from the coroplast to the gate valve grease fitting could be installed . . but, I don't think anyone has done this yet.

      The problem with all the variations of oils poured into the tank is that these concoctions float on top of the liquid in the tank or lay in the bottom of an empty tank . . . and you are trying to get lubrication from top to bottom of a 3" gate. Then . . . the seals wipe off whatever lubrication got on to the gate as it is pulled back into a cavity full of tank contents.

      For those who may not recall what led to my installation of grease fittings on my gate valves . . . a copy is attached.

      Rob

      Gate Valve Lubrication.pdf
      Cate & Rob
      (with Border Collies Molly & Angel)
      2015 Reflection 303RLS
      2022 F350 Diesel CC SB SRW Lariat
      Bayham, Ontario, Canada

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      • #18
        steve gravelle -- is the tension due to the valve or the cable? As I documented during my battle with the cables, once they are corroded there is little that can done except replace them. See https://gdrvowners.com/forum/operati...valves-315rlts for a long, exhaustive thread on the topic.

        Howard
        Forum moderators are not GD employees--we are volunteers and owners presumably just like yourself. Unless specifically mentioned otherwise, we have nothing to gain should you choose to purchase a product or engage a service we discuss on this forum.

        2017 Ford F-350 DRW, '19 315RLTSPlus

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        • #19
          Howard, thanks for the question. In my work in the last couple of days, the cable for this tank moves very freely.
          2020 Solitude 2930RL S-Class

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          • #20
            I have a leak at that site on my 2021 378MBS. The gray tank looks good and does not leak. The black tank (of course it's the black tank) looks very different. First the gate valve flange and the tank do not line up with the tank drain being slightly lower and the gate valve flange going in at an angle. I have not taken anything apart yet. I am wondering what the actual connection on the gate valve flange looks like. Or is there a connector piece in there? With all of the white sealant put on at the factory it is really hard to see.

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            • #21
              Originally posted by DMcRaney View Post
              I have a leak at that site on my 2021 378MBS. The gray tank looks good and does not leak. The black tank (of course it's the black tank) looks very different. First the gate valve flange and the tank do not line up with the tank drain being slightly lower and the gate valve flange going in at an angle. I have not taken anything apart yet. I am wondering what the actual connection on the gate valve flange looks like. Or is there a connector piece in there? With all of the white sealant put on at the factory it is really hard to see.

              The gate valve is typically glued to the tank. Obviously the glue did not hold. If it's possible to remove the gate valve as one piece, I'd take the opportunity to insert an additional piece that would allow for an quick and easy replacement of the entire valve assembly should it become necessary in the future. If you didn't get a chance yet, look at post 18 and the link to an extensive thread on the topic--there's a lot of pictures.

              Howard

              P.S. Welcome to the forum! See the Welcome Letter here: https://gdrvowners.com/forum/main-fo...to-new-members

              Forum moderators are not GD employees--we are volunteers and owners presumably just like yourself. Unless specifically mentioned otherwise, we have nothing to gain should you choose to purchase a product or engage a service we discuss on this forum.

              2017 Ford F-350 DRW, '19 315RLTSPlus

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              • #22
                Originally posted by steve gravelle View Post
                Jumping in here on this. About a year ago I bought a Bristol gate valve for the large shower gray tank. Was dealing with the limited space to remove and replace. Found that there is a bracket that can be loosened and spun so the tank can be slid to gain a larger space to reinstall the new valve and sealing rings a lot more easily. However, with the fitting in the neck of the tank it became quite unsealed. After talking to a mobile repair tech I have used in Kerrville, TX I bought Flex Seal in the can and a roll of Flex Seal tape. This combination sealed and has worked for at least a year.

                Now comes the request for wisdom. All three of the gate valves work harder than Hades. Removing the coroplast I found a small phillips screw that joined the cable and valve on the shower tank. Reinstalling this the valve does move, but hard. I recall Rob installing grease fittings. I am hoping that someone can relate a positive experience with Thetford's liquid, or vegetable oil, or ANY solution. Thanks all!
                I have used this https://a.co/d/bTDvvOP it worked really good! All three of my dump valves were very sticky and tight. Three weeks ago I ran out and tried vegetable oil. My valves work effortlessly with it as well. I followed the the instructions on the Thetford product and was shocked how well it worked. For vegetable oil I use about a cup in each tank after dumping then add 3-4 gallons of water let it sit for 5 minutes or so then cycle the valve 3-4 quickly. I am probably going to continue using vegetable oil as it is easier to get and typically always have it on hand.
                Scott & Mikaela
                2022 375 RES
                2020 F-350 DRW

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                • #23
                  Originally posted by Jshantz View Post

                  @Cate&Rob
                  Yes I have cleaned up the tank outlet and the gate valve (see pics below). I think that what I need is the ABS solvent glue. Originally it was some kind of white/yellowish putty in the connection when it was leaking a year ago. I attempted to reattach with some putty last year, but with my poor understanding of how to do this (not a plumber) I tried to replicate how is was originally done. I included a picture of the gate valve flange (glued to the section that goes inside the tank). I’m not good at this, so I really appreciate your help.

                  Click image for larger version Name:	0FD6CF94-686F-480C-86B6-EC70A6529F46.jpeg Views:	0 Size:	124.5 KB ID:	25162

                  Click image for larger version Name:	5883070D-E1B4-460C-BF42-6D0859D32514.jpeg Views:	0 Size:	84.9 KB ID:	25161
                  I have the same issue with my new 375-RES and looking to fix it. When I looked at this picture, there seems to be a slot for an O-ring that would help seal this. Is there supposed to be an O-ring in this slot, or is this just a place where the plumbers putty will fill in and help to seal it? Unfortunately, my wife and I are living in this until our house is completed, but will be a January/February project to fix it. Hoping to get it drained, cleaned up and seal properly so I do not have to keep taking down the coroplast and replace the insulation again.
                  Alan & Kim Beebe
                  2022 Solitude 375-RES

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                  • #24
                    abeebe69 -- that's the first tank-to-pipe connection I've seen (other than a fresh water tank drain) that wasn't glued together. Wish mine wasn't! At least with a clamp it can be serviced without too much drama.

                    To your specific question...sorry, but I don't know. Cate&Rob ? colan ?
                    Forum moderators are not GD employees--we are volunteers and owners presumably just like yourself. Unless specifically mentioned otherwise, we have nothing to gain should you choose to purchase a product or engage a service we discuss on this forum.

                    2017 Ford F-350 DRW, '19 315RLTSPlus

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                    • #25
                      abeebe69

                      Hi Alan & Kim . . . welcome to our owners technical forum.

                      When Grand Design went from Valterra to Bristol gate valves, they went from a glued connection to the tank, to a clamped connection. That groove certainly looks like it was meant for an O ring! I have no experience with Bristol gate valves, but if I were putting that together, I would put an O ring in that groove.

                      Rob
                      Cate & Rob
                      (with Border Collies Molly & Angel)
                      2015 Reflection 303RLS
                      2022 F350 Diesel CC SB SRW Lariat
                      Bayham, Ontario, Canada

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                      • #26
                        Rob has a great idea. Refer back to post #16 where I used Flex Seal products which has been a successful repair. I also wanted to use O rings, but availability was pretty much impossible. Maybe there is a source I couldn't find.
                        2020 Solitude 2930RL S-Class

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                        • #27
                          Try finding the size you need here: https://www.amazon.com/041-Viton-Rin...al&sr=1-4&th=1 then look for that size to see if cheaper prices can be found. The only other option is to make your own: https://www.amazon.com/Buna-N-Splici...20&sr=1-3&th=1

                          I guess a really creative person could for a silicon hump in the channel and let it dry then install.
                          Joseph
                          Tow
                          Vehicle: 2018 GMC K2500 Denali Diesel
                          Coach: 303RLS Delivered March 5, 2021
                          South of Houston Texas

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                          • #28
                            abeebe69

                            If you have a hydraulic supply/repair facility in your area, they should be able to supply an O ring. There are two parts to the spec . . . the diameter of the ring and the thickness of the ring material. Take the ABS fitting with you.

                            Rob
                            Cate & Rob
                            (with Border Collies Molly & Angel)
                            2015 Reflection 303RLS
                            2022 F350 Diesel CC SB SRW Lariat
                            Bayham, Ontario, Canada

                            Comment


                            • #29
                              Originally posted by Cate&Rob View Post
                              abeebe69

                              If you have a hydraulic supply/repair facility in your area, they should be able to supply an O ring. There are two parts to the spec . . . the diameter of the ring and the thickness of the ring material. Take the ABS fitting with you.

                              Rob
                              The problem in selecting an O ring thickness size is how tight the fitting is in the female fitting on the tank, since you can't take the female fitting with you. When installing a little plumber's grease maight help.
                              2020 Reflection 273MK
                              2005 Dodge Ram 2500 CTD

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