Can I use threaded pvc adapter for future modification?

Discussion in 'Plumbing Forum, Professional & DIY Advice, Tips & ' started by lmei007, Jun 13, 2011.

  1. lmei007

    lmei007 New Member

    Messages:
    154
    Location:
    Maryland
    I am going to cut my horizontal branch from a vertical 2-3" wye for a new counter sink drain. I am thinking use two threaded adapters (see the photo please) in the horizontal line after the vertical wye for future modification. is it allowed?

    Attached Files:

  2. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    26,293
    Location:
    Cave Creek, Arizona
    It is NOT the best idea, because there will be a "ridge" between the two threads, and if it DOES need modification some day, it is almost easier to just cut the pipe and start over with glued joints.
  3. trickydick

    trickydick New Member

    Messages:
    21
    Location:
    Belmont, NH
    Would this be a problem then if replacing a clean-out plug with a male adapter to extend my 4" drain? I'd have an awfu lot of 4" fittings to replace if I had to start over. Thanks
  4. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    26,293
    Location:
    Cave Creek, Arizona
    Again, it would not be the best way to do it, and whether you can even use the cleanout depends on whether it is a cleanout tee, or a plugged female adapter.
  5. trickydick

    trickydick New Member

    Messages:
    21
    Location:
    Belmont, NH
    Sorry hj and diyfun, I ment my reply for hj's original response, but it went to the wrong place. But in reponse to hj's above reply, the clean out is on a female adapter. I was thinking of wrapping a hose clamp around the hub to protect it from the male adapter; shouldn't the male adapter work ok considering the fact that the clean-out could be removed at times to "clean-out" and replaced to continue functioning as intended?
  6. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Messages:
    21,824
    Location:
    New England
    Female pvc fittings can split eventually if you overtighten the male or there's any long-term tension on it; or, it could last forever. Safer to cut it off and use a coupling.
  7. trickydick

    trickydick New Member

    Messages:
    21
    Location:
    Belmont, NH
    Problem is when originally installed, the female hub was butted smack-up against the wye hub leaving no room to cut-off and attach a coupling; the other end of the wye is smack-up against another wye that connedts the main stack; I need to extend this 4" line. Check-out the aerial shot that I included. (sorry about the double photo) 1219111906 - Copy - Copy.jpg 1219111906 - Copy - Copy.jpg
    Last edited: Jan 29, 2012
  8. Hackney plumbing

    Hackney plumbing Homeowner

    Messages:
    1,174
    Location:
    Alabama
    Cut the female adapter off even with the hub and use a pasco 3" ram bit aka fitting saver. It will remove the rest of the adapter thats solvent welded in the wye. Then simply solvent weld your new pipe in.
  9. dlarrivee

    dlarrivee New Member

    Messages:
    1,172
    Location:
    Canada
    I'm not sure how else you expected the clean-out to be installed into the wye...

    It was never going to be installed in a way that would allow you to cut the threaded bit off and attach a coupling.

    Instead of buying a fancy tool, just replace the whole wye...
  10. Hackney plumbing

    Hackney plumbing Homeowner

    Messages:
    1,174
    Location:
    Alabama
    Yeah I'm against doing things the easy way too......nevermind a tool designed to do whats being asked. Just replumb the lower half of the house.
  11. dlarrivee

    dlarrivee New Member

    Messages:
    1,172
    Location:
    Canada
    Why would someone buy a specialty tool that they will only use once, when they could simply cut and glue in a new fitting?

    If you're a pro and you expect to use a tool 100 times it makes sense.

    Is replacing a wye really a large task for you?
  12. Hackney plumbing

    Hackney plumbing Homeowner

    Messages:
    1,174
    Location:
    Alabama
    From the pic its hub to hub with a combo. Whats the price of a 3x2 wye and a 3" combo and a couple couplings?
  13. dlarrivee

    dlarrivee New Member

    Messages:
    1,172
    Location:
    Canada
    That depends on where you live, and how far away the specialty one-time-use tool is as well as the premium you might be charged for it.

    I could have done this in the time between the photo above being posted and your last comment, the fittings are easy to come by and cheap enough.
  14. Hackney plumbing

    Hackney plumbing Homeowner

    Messages:
    1,174
    Location:
    Alabama
    I dont recall him asking the cheapest way or the easiest way for you to do it. I think he wants to know how the easiest way for him to do the job without cutting the fittings out.
  15. dlarrivee

    dlarrivee New Member

    Messages:
    1,172
    Location:
    Canada
    Well in that case the easiest way is to hire a plumber from Florida.
  16. trickydick

    trickydick New Member

    Messages:
    21
    Location:
    Belmont, NH
    Ok thanks for all of the advise, but let me clear-up a few things.These fittings are all 4"-do they make a 4" fitting saver? Secondly, that 4x2x4 wye butts-up to a 4x4x4 wye; you can see the vertical stack going down in bottom part of the photo; what might a 4" pasco fitting saver cost? Why wouldn't the hose clamp help keep the hub from splitting? I would assume glueing in the adapter is out of the question
  17. Hackney plumbing

    Hackney plumbing Homeowner

    Messages:
    1,174
    Location:
    Alabama
    I think he lives in N.H. It probably would be better to get a local plumber in his area.

    Yes a 4" fitting saver is made by pasco. I think they cost me around 40.00. 4" fittings are not cheap. The hose clamps may keep it from splitting....then again it may not.


    You could always throw some pvc solvent on the male and female threads and screw them together quickly and let it set for a day or so. LOL
  18. dlarrivee

    dlarrivee New Member

    Messages:
    1,172
    Location:
    Canada
    If you aren't in a hurry, get that fitting saver, or get the better version the "pipe-hawg"...

    They definitely make them in 4", and when you're done with it, Hackney will buy it from you.
  19. trickydick

    trickydick New Member

    Messages:
    21
    Location:
    Belmont, NH
    Thanks for all the help, didn't mean to cause such a fus; just looking for some friendly advise. you see I had alk my fittings and pipe ready to go and then I found this other info on the problems others have had with possible hub splittings. I think at this point I'll see what happens by using clamps on the hub and adapter; if it splits, then I can make the choice of using the pasco or replacing (2) 4" wyes. That being the case, any tips on using a fitting saver or is it self explanatory? Thanks again in advance
  20. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Messages:
    21,824
    Location:
    New England
    http://www.pascospecialty.com/catalog/PASCO_CATALOG_C.pdf it's tapered so as long as you keep the thing straight, and have a powerful enough drill motor, it just reams out the pipe, leaving a socket you can then stick a new piece of pipe into. A threaded hub will have a lip that could be a place for crud to get caught. A straight pipe/coupling done properly, is fairly smooth with the ends aligned with no threads or other rough edges to catch things. Other companies make simlar tools. A glued joint ends up being essentially double thickness, welded together. A threaded joint relies on the strength of the somewhat thinner single layer. A solvent welded joint is a lot stronger and smoother going through it.
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