Inserting a fitting into the middle of a drainpipe?

Discussion in 'Plumbing Forum, Professional & DIY Advice, Tips & ' started by harleysilo, Feb 12, 2007.

  1. harleysilo

    harleysilo New Member

    Messages:
    101
    Location:
    Georgia
    So how the heck do you insert a t or wye into the middle of a piece of pvc if you can't move the pipe to the left or right or up or down.....? Is that when you have to use a fernco or whatever you guys are arguing about?

    I may need to put a wye smack dap in the middle of this drain pipe, but it's plumbed in to the septic on one end, and 90's at the other, can't move it back an fourth.

    So I guess I could cut out a section, like 4ft, glue up the wye, then a section of pipe that just barley fits, glue it in, then use one of those pvc pipe unions or whatever you call them that slips over, put pipe together and slip it back over joint...

    this pipe
    [​IMG]
  2. Gary Swart

    Gary Swart In the Trades

    Messages:
    7,308
    Location:
    Yakima WA
    There are a couple of ways that you can do this. First, you can not use a Fernco for this application. You could use a banded coupling which is somewhat similar to a Fernco but is approved for this application. A Fernco is a neoprene sleeve with a SS hose clamp on each end. A banded coupling has a band the full length of the coupling. The other possibility is to use PVC slip couplings. This work very well even in pressurized systems.
  3. Randyj

    Randyj Master Plumber

    Messages:
    1,047
    Location:
    Alabama
    Ya might have a little difficulty finding one but there are "repair" couplings which look exaclty the same as a regular coupling except that they do not have the stop ridge in the center. This allows you to slide the coupling back over the pipe, insert the new piece, then slide the coupling over the joint. Getting the glue to stay where you want it can be tricky.
  4. harleysilo

    harleysilo New Member

    Messages:
    101
    Location:
    Georgia
    Any details on overcoming the trickyness?
  5. markts30

    markts30 Commercial Plumber

    Messages:
    630
    Location:
    Phoenix, AZ
    A couple tricks for the repair coupling...
    Make a mark on both sides of the joint 6" back...
    ensure you bevel the edges of the 3" pipe with a file...
    Use lots of glue on the pipe and coupling...
    Wear old clothes and some gloves and lay out drop cloths...
    Have fun...
    LOL
    (the marks are so that you can slide the coupling back to the point where the joint will be in the middle - this is the easiest way to ensure you are getting the coupling centered on the joint...)

    If you cannot find the repair coupling without the stop, you can file the stop out of a reqular one - it will take a while but it is doable with a sharp half-round file... (done it - did not like it, but did it...)
  6. TedL

    TedL New Member

    Messages:
    604
    Location:
    NY Capital District
    Fernco is a brand name/manufacturer, and can be found on both types of couplings, including at the big boxes. The Proflex line (made by Fernco) can be used.
  7. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Messages:
    21,814
    Location:
    New England
    You have to be quite quick and have everything lined up just right (it takes practice) to use a repair coupling. Use one of the banded couplings, you'll be much less frustrated. If you are too slow, you'll end up with the coupling welded part way to where you want it, and you'll have to cut it off and start over.
  8. Gary Swart

    Gary Swart In the Trades

    Messages:
    7,308
    Location:
    Yakima WA
    This link will show you the simplest and easiest way I know of in repair PVC pipes with a break or installing a fitting in an existing line. The standard slip coupler, even without a center stop, is very difficult to install due to the rapid set up of the solvent welds. I've used these couplers with sprinkler lines with 100% success, and those lines are under pressure. Your drain lines are not pressurized.

    http://www.kbico.com/downloads/pdfs/QF-Specs.pdf
  9. kordts

    kordts In the Trades

    Messages:
    551
    Location:
    exurban Chicago
    I would use no-hub or pro-flex couplings. Glue some baldies into the ends of the wye. Measure what ya got. Cut out that much, and there ya go.
  10. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    26,263
    Location:
    Cave Creek, Arizona
    connection

    You have to use two couplings, not one. A repair coupling sounds good in theory, but in practice it is almost impossible to coat the inside of the coupling, the outside of the pipe, slide BOTH couplings onto the pipe, and then pull BOTH of them into position, before one, or both, are bonded to the pipe.
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