Connecting CPVC to PVC

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by dlee, May 24, 2010.

  1. dlee

    dlee New Member

    Joined:
    May 24, 2010
    Location:
    Maryland
    I am trying to hook up a new gas pool heater and the Heater has a 2" CPVC union nut with flanged pipe nipples and the rest of the pool plumbing is 2" PVC. The 2" PVC pipe fits tight in the 2" pipe nipple, but everything I have read, indicates that you cannot glue dissimilar plastics together. Anyone have any recommendations on how to connect the two pipes together?
     
  2. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Joined:
    Sep 2, 2004
    Occupation:
    Retired Systems engineer for defense industry.
    Location:
    New England
    A no-hub connector should work. Keep in mind that PVC is normally not rated for pressure and the no-hub is a drainage fitting, not a pressure one, but it should handle some. Some pvc pipe that are rated for pressure, but it is not supposed to be used for hot water. What is the highest temperature of the water outlet of the heater? This could be a major problem, regardless of how you connect the two.

    Another possibilty might be something like a Sharkbite, but I don't think they come that large (I think 1" is the largest). You could glue male threaded adapters on each end, then screw that into a threaded coupling, but you'd need to be able to separate the ends enough to get those in, glue one end, thread both adapters in place, then glue them to their respective bits. You could do the same thing except use a union to connect each side - that would require less separate to get the pieces in.
     
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  4. Terry

    Terry Administrator Staff Member

    Joined:
    Aug 17, 2004
    Occupation:
    Plumber
    Location:
    Bothell, Washington
    You can't use a no hub connector for pipe under pressure, those are for waste pipes that never see more then 10 PSI.
     
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