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Old 06-16-2024, 02:20 PM   #1
Drewl
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New grey water tank help

Good day all. I've installed a new grey tank. The outlet is 3 1/2 OD. The old tank has a 3 inch eccentric fitting the slides in and glued. I can't find a 3 1/2 inch eccentric fitting to replicate the old method. Any ideas? All abs fittings that I've seen are 3 or 4 inch.
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Old 06-16-2024, 03:16 PM   #2
chuckster57
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I just replaced a gray tank. The outlet fitting isn’t “glued” in with ABS cement. I used self leveling Dicor and a screw type band clamp, it goes inside the tank outlet.


https://valterra.com/product-categor...-adapters-oem/
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Old 06-16-2024, 03:19 PM   #3
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I wads hoping to replicate factory install process but it seems not possible..
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Old 06-16-2024, 03:26 PM   #4
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Quote:
Originally Posted by Drewl View Post
I wads hoping to replicate factory install process but it seems not possible..
The repair I did is “factory” install. The factory may use a different sealant, but the use of sealant and a band clamp is how the factory does it. I’ve been working on RVs for a “little bit” (look at my sig), and have seen well over a thousand waste tanks/drains.
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Old 06-16-2024, 07:24 PM   #5
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This is the original tank fitting setup. No rubber or screw bands.
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Old 06-17-2024, 02:54 AM   #6
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So the fitting I linked to doesn’t fit inside the drain outlet? Where did you get the tank?
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Old 06-17-2024, 04:36 AM   #7
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What about something like in the link? Use the bands to tighten?

https://hpsperformanceproducts.com/p...YaAqYSEALw_wcB
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Old 06-17-2024, 04:59 AM   #8
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Maybe connect with one of these: Click here.

I had a leak on my connection. Unfortunately, mine were glued and it was leaking right at the joint. If I cut out the bad part, it would have meant cutting it flush at the tank and then there would be nothing to glue back into.

So, I got one of those Fernco boots that fit over the existing joint. There was enough "lip" on the tank for the clamp to go around, and then I was about to cut out the bad part. Also, when replacing the black drain pipe, the rubber allowed me to re-attach without having to take anything else apart. Downstream, that pipe connected to the black tank outlet (they come together at one outlet, 2 valves, but 1 outlet). Otherwise, I would have had to replace everything. The rubber made it extremely easy to re-attach. The rubber filled the gap where the break was, and the rubber clamp was just right to clamp onto the remaining stub on the tank itself.

It worth considering. They come in all sizes.
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Old 06-17-2024, 06:15 AM   #9
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Quote:
Originally Posted by dutchmensport View Post
Maybe connect with one of these: Click here. ....
That would work, but would not be "eccentric" (with the final opening at the bottom of the adapter). The end result would be standing water in the bottom of the new tank. The "eccentric" fitting allows the tank to fully drain where the fitting you link will have the final connection "half the reduction measurement" (in this case 3" to 1.5" leaving 3/4" rise from bottom) above the bottom of the tank. The way RV tanks are built, wide, long and skinny, 3/4" can mean 10-15% of tank capacity. While either type is "workable" using the rubber reducer could leave enough water in the bottom of the tank to cause freeze problems in some situations.
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Old 06-17-2024, 06:50 AM   #10
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The eccentric fitting will go inside the opening with room to spare. 3 inch into 3 1/4 I D. Tank came from Icon industries in Manitoba.
The silicone tapered one may work if it's eccentric.
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Old 06-17-2024, 07:51 AM   #11
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Thanks for the replies. I'll post the results.
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Old 06-17-2024, 09:03 AM   #12
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Quote:
Originally Posted by Drewl View Post
The eccentric fitting will go inside the opening with room to spare. 3 inch into 3 1/4 I D. Tank came from Icon industries in Manitoba.
The silicone tapered one may work if it's eccentric.
Is the tank opening rigid? The one I just did had easily 1/4” of play and the band clamp closed it.
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Old 06-17-2024, 04:21 PM   #13
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This is what I used. 3 inch rubber connector. Both the eccentric fitting and the tank pipe were 3 inch OD. I measured wrong originally wanting the fitting to work the same as the old one. All good now.
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Old 06-17-2024, 06:05 PM   #14
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It looks like you got it working and that’s what matters. Thanks for posting an update.
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Now an RVIA registered tech. Retired from Law enforcement in 2008 after 25+ yrs.
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