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Old 11-12-2013, 03:32 PM   #1
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1962 19' Globetrotter
Los Angeles , California
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Toilet Flange to Black Tank Fitting

I am currently adding new tanks to the GT and as usual flying blind with no reference material. The new toilet mounts over a toilet flange and the new ABS tank needs a solid weld or bulkhead fitting to handle the compression and shock from being a roadworthy install.

I sourced a 3" ABS recessed tank fitting but am concerned that the ABS cement is not enough to hold this bad boy in place. Should I weld it? Why isn't this item made like a bulkhead fitting that clamps in place? The flange is bumpy and has a stippled pattern, does this indicate that it should be sealed in a certain way?

I'm no plumber, but know better than to trust some spray on ABS cement over a weld when it comes to a solid connection where I want keep my solid waste contained.
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Old 11-12-2013, 03:39 PM   #2
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ABS solvent from a big box store is thicker and has filler plastic involved in the adhesive. You can add a little extra solvent if concerned. You can also take a small piece of ABS plastic (say like an ABS elbow or union) and chop it up in little pieces, then put in a glass jar with lid and cover with MEK or Acetone to create a very thick slurry. Then apply with a natural brush, building up around the outside edge if you feel uncomfortable.

The normal ABS solvent should be sufficient though. I know how you feel. I'm making all my own ABS tanks, and I'm heat welding everything, then applying a thick slurry on top of all those seams.

Rob.
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Old 11-12-2013, 03:53 PM   #3
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Thanks Rob, I'll start my slurry now. Would prefer to see a nice welded bead on it but will see how it goes.

What really bugs me is the new tank sags a bit across the top so when I screw in the flange, it's all going to be under tension. I can just see a nice bump in the road and pop, my black tank is belching and releasing sewer gas.
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Old 11-12-2013, 04:02 PM   #4
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Your black tank should have another tube coming in that vents through the roof. That's where the smell should go. Heat rises, and the vent is way above your head. You should have 3 holes in your black tank. The toilet flange hole, the vent stack, and the dump valve.

Rob
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Old 11-13-2013, 05:17 PM   #5
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Yep, I'll make sure to install the vents. I'm no hydrologist but understand displacement. I just don't want that black tank seal to bust open, it should be contained below the subfloor if that happens, but what a mess.
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