We have a 2021 transcend 221rb. Does anyone know how deep the bw tank is? My inlet pipe from the toilet is 3.5 to 4 inches from the bottom of the tank. Once it is 1/3 full everything solid has to sit in the pipe, paper etc does not sink. I would think the pipe should be at 8" from the bottom of tank.
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howson @Cate&Rob, Can either of you confirm if this is the correct tank? https://www.granddesignrv.com/owner-...s/detail/48846
based on the drawing the tank tapers from 6" to 8".Joseph
Tow Vehicle: 2024 GMC K3500 Denali Ultimate Diesel
Coach: 303RLS Delivered March 5, 2021
South of Houston Texas
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Mokey Jlawles2
All holding tanks are in the range of 6" to 8" deep (per the drawing that Joseph linked) because of the available space under the floor. The drain (and vent) pipes entering the tank should sit in rubber grommets which extend only about 1" into the tank. It is possible and has been reported/discussed here before that sometimes a pipe gets pushed too far through the grommet during production, which can reduce the available volume of the tank as you describe. This more often occurs when the vent pipe is pushed too far into the tank because as soon as the liquid level covers the end of the vent pipe, air cannot be displaced to allow more liquid in.
It would seem that the pipe (or pipes) going into your tank need to be shortened. Sometimes the grommet can be reused, but to be sure of a good seal, it should probably be replaced at the same time.
RobLast edited by Cate&Rob; 07-07-2021, 06:48 AM.Cate & Rob
(with Border Collies Molly & Angel + Kitties Hazel & Elsie)
2015 Reflection 303RLS
2022 F350 Diesel CC SB SRW Lariat
Bayham, Ontario, Canada
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Originally posted by Mokey View PostIs that the only tank they use? I dont see on the diagram how far in the inlet pipe should go. It is a 2021 Grand Design Transcend 221RB
Vin - 573TT2723M8815719
Substitutions very possible--only GDCS will know for sure by consulting the build sheet.
I do not know vent criteria for any tank (sorry).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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In the attached picture, you can see the outer "slot" where the grommet fits to the tank top and the inner "ridge" at the bottom that is suppose to stop the pipe from going in any further. It is not difficult to push the pipe past this ridge during installation. If the pipe stops at this ridge, it will only be about 1/2" into the tank.
Rob
Cate & Rob
(with Border Collies Molly & Angel + Kitties Hazel & Elsie)
2015 Reflection 303RLS
2022 F350 Diesel CC SB SRW Lariat
Bayham, Ontario, Canada
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Contact Grand Design with your VIN and they will send you the specs for your exact tank.
Worked for me
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Rob, Chris and fur baby Maya
2019 Solitude 374TH, Victron Multiplus II 3000 2x120, 600AH of Battle Born LiFePO4, 1800W Solar, Blue Sky CC's, Starlink
2023 GMC Denali Duramax 4x4 DRW LB CC, Curt Q25
Follow us at https://rctravels.rmcd.ca/
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Originally posted by KamFlyer View PostContact Grand Design with your VIN and they will send you the specs for your exact tank.
Worked for me
RobCate & Rob
(with Border Collies Molly & Angel + Kitties Hazel & Elsie)
2015 Reflection 303RLS
2022 F350 Diesel CC SB SRW Lariat
Bayham, Ontario, Canada
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