Plumbing overflow to sump

David Abbott · Aug 25, 2021

While plumbing my overflow to the sump I've noticed that the pipes don't seat all the way in the fittings (90's, unions in the dry fit) when I start to glue all this together all the pipes will be to short?? after the pipes are FULLY SEATED in the fittings. Should I glue as I go or what. THANKS

mike89t · Aug 25, 2021

I encountered the same problem this week. Ended up with a run that didn't fit and had to improvise some.

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I think if I did it over again I would put a mark on the pipe to know where to stop inserting it into the fitting.

NowGlazeIT · Aug 25, 2021

After I do the dry fitting I mark the pipe and measure how long it needs to be, then I measure how deep the fittings are, add it up and cut a new pipe.
you want to use all the space in the fitting, this ensures a proper seal as the two weld together, that is why they make the fittings slightly tapered

regionreef219 · Aug 25, 2021

I agree with the above about putting a mark on the pipe when doing the intial fit up. This will ensure you push it in just the right distance.

I have a couple joints on my PVC pipes that are only engaged about 0.3". If using PVC cement and done correctly, I dont think having small insertion lengths will be a problem in basic sump runs since the cement melts and bonds the pvc. If you have a high pressure setup it might be more of a problem but not if your only running to a sump under the tank I would not worry about it.