Transition fitting from CPVC to PEX

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by bingo, Aug 16, 2008.

  1. bingo

    bingo New Member

    Messages:
    10
    Hi

    I'm remodeling a bath and in the wall I am suprised to see CPVC running up to the shower valve. The rest of the house is copper so I'm guessing this was an earlier remodel.
    The CPVC is in pretty a poorly braced condition and since I have to replace and relocate the valve I want to get rid of the CPVC > I was hoping to cut out as much of the 1/2" CPVC as I can see and replace it with properly braced copper or PEX up to the valve (I've done plenty of both).

    I'm totally inexperienced with CPVC! What fitting do you suggest that I use to go from CPVC to PEX (I use Wirsbo/Uponor/Aquapex fittings using a manual expander.) The shark bite things?

    Alternatively, what do I use to go to copper...of course I can't expect to solder to it or it will melt! So I would guess I'd have to glue on a female thread onto the CPVC into which I would put a male 1/2' threaded copper end. But from there, how do I solder it without the heat affecting the CPVC?

    Thanks in advance,

    bingo
  2. Terry

    Terry Administrator Staff Member

    Messages:
    15,443
    Location:
    Bothell, Washington
    You can not use a plastic female fitting. Whatever you screw into it, will split it. Any inspector will make you take it out.
    Which is the nicest thing possible they can do.
    You will be taking it out at some point, usually after it has ruined your floors.

    Sharkbites will work as transistions between
    copper x PEX
    copper x CPVC
    PEX x CPVC
    Did I miss any?
    Oh Yeah, Female copper Female Adapter x CPVC Male adapter. "added Sunday morning"
    Female copper adapter x PEX male.

    I like running copper to the valve, at least enough so I can strap it to something.
    Last edited: Aug 17, 2008
  3. nhmaster

    nhmaster Master Plumber

    Messages:
    3,189
    Location:
    S. Maine
    I would probably put a cpvc male adaptor on the pipe and a pex female on the pex pipe.
  4. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    27,296
    Location:
    Cave Creek, Arizona
    ?

    See the previous post by Terry to find out why that would be a bad idea.
  5. nhmaster

    nhmaster Master Plumber

    Messages:
    3,189
    Location:
    S. Maine
    That's a Female cpvc fitting that cracks, the male fitting holds up just fine.
  6. Redwood

    Redwood Master Plumber

    Messages:
    7,450
    Location:
    Connecticut
    I would consider using one of these and a pex female or, a sharkbite.

    [​IMG]
    Last edited by a moderator: Aug 17, 2008
  7. nhmaster

    nhmaster Master Plumber

    Messages:
    3,189
    Location:
    S. Maine
    Yep, that's probably better than the std male adaptor. Truthfully I never use cpvc so I don't keep up on the available fittings.
  8. kingsotall

    kingsotall Plunger/TurdPuncher

    Sharkbites allow transitioning from Qest, too.
  9. bingo

    bingo New Member

    Messages:
    10
    Hi all and thanks....so would that thing proposed by Redwood and seconded by Terry be a standard/widely available item (ie Big Orange Box) or do I need to make the separate trip to my plumbing house?

    Would it just be called a CPVC to brass male thread adapter? CPVC takes a specific adhesive, right?

    thanks
  10. Redwood

    Redwood Master Plumber

    Messages:
    7,450
    Location:
    Connecticut
    I don't know if big box has them or, not. I really see very little CPVC usage here. Yes, CPVC requires the use of a CPVC cement.
Similar Threads: Transition fitting
Forum Title Date
Plumbing Forum, Professional & DIY Advice PVC transition to Cast Iron May 31, 2014
Plumbing Forum, Professional & DIY Advice Abs-PVC Transition Cement for just Abs by mistake May 6, 2014
Plumbing Forum, Professional & DIY Advice transitioning from galvanized to copper Dec 16, 2013
Plumbing Forum, Professional & DIY Advice vertical-to-horizontal transition: long bend only or or Y plus 45 with cleanout? Jun 14, 2013
Plumbing Forum, Professional & DIY Advice Best Transition Oct 29, 2012

Share This Page