I have an unfinished basement, and I installed a redirector for my sump pump output so it can be drained to the sanitary sewer during winter months (and yes, I'm paying for the right to do so, and I'm following the rules :)). I installed a wye in the vertical drain pipe, and I needed a way of reconnecting said pipe after introducing the new fitting. To do this, I took a section of the 3" pipe, glued it to the top of the wye, and joined it to the original pipe with a Fernco fitting (specifically, this guy).

The question: is it safe to leave the Fernco fitting in place and enclose it in a wall when I go to finish the basement?

  • My former roommate (in the pipefitter's union), would have PVC 'repair couplings'. They were like a straight coupling, but didn't have a stop on the inside, so you could slide it fully over one pipe, join the two up, then slide it to join the two. It looks like they also might be called a 'slip coupler'. You want to prep the pipes first, and mark them so you know you hae the coupling centered over the break.
    – Joe
    Aug 6, 2010 at 12:01

1 Answer 1


I wouldn't say its a great idea in my opinion - but on the other hand, using a coupling is generally code compliant.

I'm not a huge fan of those repair couplers, but they are usually approved for joining like materials underground if they're fully sheathed (the coupling is surrounded by stainless steel - called a mission coupling) so I don't see why it would be a problem in the basement unburied. Whatever you do, make sure you properly cement that coupling in place.

I would call the inspector on that one, just to be sure. Something like this is one of those plumbing code issues which varies from jurisdiction to jurisdiction. When dealing with sanitary sewer piping, I wouldn't scrimp out on a fitting just to save a few bucks... the thought of a potential sewer joint failure in your basement is too awful to imagine.

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