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Old 05-01-2016, 01:06 AM   #31
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Any ideas on what kind of sealant I could use? Somebody mentioned dicor, but I don't know what that is. Can you get that at home Depot too? I don't know about putty. All the putty I've ever used wasn't real tacky. This stuff is like chewing gum.

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Old 05-01-2016, 08:03 AM   #32
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Any ideas on what kind of sealant I could use? Somebody mentioned dicor, but I don't know what that is. Can you get that at home Depot too? I don't know about putty. All the putty I've ever used wasn't real tacky. This stuff is like chewing gum.

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Dicor is a roof sealant. Is the stuff really sticky, like chewing gum on the sidewalk on a hot day? If so it will be a butyl sealant. I would look for a butyl/rubber based caulk. DAP makes one that is used as a gutter sealant.

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Old 05-01-2016, 08:19 AM   #33
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I wouldn't have too much concern about the sealant on the large pipe. From the photo, it appears to be held on with a hose clamp so that will do most of the sealing. Is it a fernco rubber style coupler too?
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Old 05-01-2016, 08:44 AM   #34
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Dicor is a roof sealant. Is the stuff really sticky, like chewing gum on the sidewalk on a hot day? If so it will be a butyl sealant. I would look for a butyl/rubber based caulk. DAP makes one that is used as a gutter sealant.

Aaron

Yes it is tacky like chewing gum. Hopefully the Depot will carry something like that.

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Old 05-01-2016, 08:47 AM   #35
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The mechanical connection is because the Alpha systems tanks are MDPE and the piping is ABS. No such thing as an adhesive for MDPE. Even the epoxies they say will work eventually will fail. The only sure thing is heat weld and for that you would need to be joining MDPE to MDPE.

My Roo is the same arrangement and some day in the future I want to reconfigure all that piping to gain back the 2" of elevation at the outlet they lost putting it together. I suspect the sealant is a butyl product. The good thing is that an MDPE tank is much less prone to cracking or punching a holes through it than an ABS holding tank.

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Old 05-01-2016, 08:48 AM   #36
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I wouldn't have too much concern about the sealant on the large pipe. From the photo, it appears to be held on with a hose clamp so that will do most of the sealing. Is it a fernco rubber style coupler too?
No coupler. The end of the large pipe is simply pushed inside the hole on the black tank. There is an o-ring on the end of the pipe, but I have a feeling it doesn't do much.

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Old 05-01-2016, 09:06 AM   #37
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No coupler. The end of the large pipe is simply pushed inside the hole on the black tank. There is an o-ring on the end of the pipe, but I have a feeling it doesn't do much.

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How about a close up of the O ring on the pipe?
That fitting on the end just appears to be a standard ABS sleeve adapter. I doubt they had a special fitting manufactured just for this application. Probably more like..................."lets try shoving an O ring in there" "Well that still leaks" "Ok lets goober it up with whatever schmoo we have laying around"
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Old 05-01-2016, 09:07 AM   #38
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No, no, no. I saw someone say that this was PVC, and you could use PVC firings.
This is ABS pipe, NOT PVC, and you can't get this from Lowe's/ HD
And you shouldn't mix PVC with ABS

The clamp on coupler might work ok, but I'd be worried about how well that'll last, and would want to add an extra support brace nearby.

Amazon carries everything you need (including the ABS specific solvent glue)
I've just been working on a big plumbing mod, so know what's involved.

Here are the parts you'll likely need: -
Oatey 30999 ABS Medium Cement, Black, 4-Ounce

NIBCO 5801 ABS Pipe Fitting, Coupling, Schedule 40, 3" Hub

Others suggestions for fixing the MDPE tank connection sound good

You don't use any primer before the ABS solvent unlike PVC. just the glue above

Let me know if you have any questions or need more help. Good luck
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Old 05-01-2016, 09:18 AM   #39
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Lowes does indeed sell ABS.

Shop Charlotte Pipe 2-in x 20-ft ABS DWV Pipe at Lowes.com
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Old 05-01-2016, 09:24 AM   #40
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OK, I know they "sell" it, but at least in this part of the country they don't stock it, and you have to special order. I know I tried, and the shipping cost and time were excessive.
Maybe it's different elsewhere in the country.

The one things that I didn't get from Amazon was the pipe itself. I got that from Jet.com (fulfilled via Zoro). 10ft length of 3" pipe under $22 with free delivery in 3 days
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