Copper pipe too short for tub spout

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by Deb 88, Oct 21, 2015.

  1. Deb 88

    Deb 88 New Member

    Joined:
    Oct 21, 2015
    Location:
    Durham, North Carolina
    Hi all,

    Well we moved into our recently purchased house only to find out that the diverter on the tub spout leaked horrendously. We were unable to remove what appeared to be a threaded spout (it kept turning but not coming off), and finally called a plumber who was kind enough to fulfill my request and cut off the old spout (he wanted to go straight to cutting the drywall).

    It turns out that the copper pipe had been cut far too short for a slip on spout (only 1 1/4 inch from tile) and so some sort of adaptor had been screwed on (with a set screw), and then this screwed into a front-end threaded spout. (Apologies for my non-technical language)

    I put this "adaptor" into a new universal spout however once it was all screwed on, it still leaked a little at the wall (only when the diverter was on to the shower, not when just the bath was running). I undid/redid it all again but this made no difference.

    At Lowe's today, they suggested I get a Shark tooth adaptor to slip onto the copper pipe and then screw on a rear-end threaded spout, however when I set this all up with the spout I saw that this will cause the spout to stick out from the wall by a good inch so not a solution.

    My only other thought before cutting into the drywall is to try to solder a male adaptor onto the pipe, but the pipe isn't long enough to do this.

    Can I just put the original adaptor back on and silicone it, hoping that that will stop any leaks? Is there any way I can get a shorter connection to screw in the spout (to connect shark tooth adaptor and front threaded spout?)

    The plumber seemed to think the only way was to cut into the drywall and replace pipes and I may have to give up and let them do that, just trying to see if anything else is possible!

    Thanks
     
  2. Reach4

    Reach4 Well-Known Member

    Joined:
    Sep 25, 2013
    Location:
    IL
    How about soldering on a coupler, and then soldering an extension to that?


    Hmmm. [​IMG]



    What would really be nice is if you could solder onto your existing pipe the RP12307

    [​IMG]

    adapter that comes with the Delta Faucet RP17454 and RP17453 diverter faucets. My notes say that the adapter should be between 1/4" and 1" from wall surface. Those are especially nice diverters. Medium priced, but really functional. I did not solder mine on. I am afraid that the soldering is done inside where the O-ring is.
    I doubt that would clear the OD of the coupler.
     
    Last edited: Oct 21, 2015
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  4. Terry

    Terry Administrator Staff Member

    Joined:
    Aug 17, 2004
    Occupation:
    Plumber
    Location:
    Bothell, Washington
    [​IMG]

    The Delta adapter that can either installed with a nipple, or soldered on.
    There is room under that for a coupling and an added section of copper.

    GOOD

    [​IMG]

    They make a few spouts that work with that .

    [​IMG]

    And their basic diverter spout.

    GOOD

    We love using the Delta spouts in this situation.

    What I don't like is this style of tub spout below.
    There are too many places for it to leak.

    [​IMG]

    This one is Grohe, but the same junk is sold under other brands too.
    JUNK

    [​IMG]


    [​IMG]

    I would not install this again.
    Junk
     
    Last edited: Oct 21, 2015
  5. Smooky

    Smooky In the Trades

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    Location:
    North Carolina
  6. Deb 88

    Deb 88 New Member

    Joined:
    Oct 21, 2015
    Location:
    Durham, North Carolina
    Terry, let me just confirm

    [The Delta adapter that can either installed with a nipple, or soldered on.
    There is room under that for a coupling and an added section of copper.]

    So if I solder on an added section of copper using a coupler the Delta Adaptor will still be able to slide on top and be secured with the set screw the correct distance from the wall?

    When you say installed with a nipple, would I still need a longer section of pipe for this?
     
  7. Reach4

    Reach4 Well-Known Member

    Joined:
    Sep 25, 2013
    Location:
    IL
    http://answers.deltafaucet.com/answ...ing-tub-spout-questions-answers/questions.htm says "The RP12307 tub spout adapter measures 1.80" in length and 1.12" in diameter."

    That Delta adapter can sweat (solder) onto 1/2 inch copper pipe, or can screw on to a 1/2 inch NPT nipple.

    Rather than sweat a coupler on, I think you have the option of putting a 1/2 copper to 1/2 NPT male adapter on your pipe, I think after cutting down your existing pipe a bit. [​IMG] The adapter gives you the same thread that a nipple would. After soldering, the tip of the adapter in that case should be 5/8" to 1-5/8" from the wall surface. You would aim for 1-1/8 to put you right in the middle of the range that works. I would think you would want to have everything with you to check with real parts before cutting or soldering stuff. I think I wrote things down correctly, but have the real parts to make sure.

    When screwing the Delta adapter to the 1/2 NPT adapter, you would use teflon tape. I would put a little plumber's silicone grease on the O-ring before screwing on the spout, but I think that is not required.
     
    Last edited: Oct 22, 2015
  8. hj

    hj Moderator & Master Plumber Staff Member

    Joined:
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    Occupation:
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    quote; e Delta Adaptor will still be able to slide on top and be secured with the set screw

    The Delta adapter I have sitting next to me does NOT have a "set screw". It either solders or screws on to a pipe thread.
     
  9. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Joined:
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    Occupation:
    Retired Systems engineer for defense industry.
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    New England
    The nice thing about the Delta adapter is that you have some flexibility on where it is mounted, then, you have more flexibility since the spout is then screwed onto the adapter. Since it is sealing to the spout with the o-ring, getting it exactly at the right distance so that it is tight and against the wall is not an issue...it's waterproof from the o-ring seal, the screw threads just hold it in place. If you use a standard threaded adapter, the tapered pipe threads require it to be just at the right place (depth) so that it can get tight enough to seal when it just comes up against the wall. ANd, I think the Delta pull-down divertor works better longer.
     
  10. Reach4

    Reach4 Well-Known Member

    Joined:
    Sep 25, 2013
    Location:
    IL
    You are mistaken about that. There is a significant range of acceptable protrusion of the tapered thread that works fine. The spout then screwing onto the Delta adapter is what provides the range of adjustment.

    With the old server there were others frequently making double posts. That has been cured by the new faster server.
     
  11. Terry

    Terry Administrator Staff Member

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    Occupation:
    Plumber
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    I would pick up a Delta spout that uses this adapter.

    Add a coupling and pipe, solder that up, then add the adapter and solder that.
    The spout spins on. They have several types of diverter spouts to choose from.
    No set screw, it just spins on.

    [​IMG]

    The Delta adapter

    [​IMG]

    Or if it's a thread on spout.
     
    Last edited: Jan 23, 2016
  12. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Joined:
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    Occupation:
    Retired Systems engineer for defense industry.
    Location:
    New England
    I was referring to using a conventional, screw-on spout, not the Delta unit. A double-post happened to me today...the system was taking forever to echo my keystrokes, and did another double-post.
     
  13. Bender1524

    Bender1524 New Member

    Joined:
    May 22, 2020
    Location:
    Kansas City
    So if my Delta adapter has a set screw, is soldering still required? Or can I just cut the copper stubout to the right length, and tighten the set screw? I can't tell if soldering is just to hold the adapter in place (like a set screw) or if it has other purposes. Just seems too easy to have a set screw vs soldering.
     
  14. Terry

    Terry Administrator Staff Member

    Joined:
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    Occupation:
    Plumber
    Location:
    Bothell, Washington
    The set screw also works. That one seals with the O-Ring inside on the copper.

    The other one is IP or solder.
     
  15. Reach4

    Reach4 Well-Known Member

    Joined:
    Sep 25, 2013
    Location:
    IL
    What I am now suspecting is that the RP33794 , the adapter that has a set screw, mounts closer to the wall than the RP12307 (IP or solder) adapter. I suspect no spout is compatible with both. Not sure.

    The RP12307 tub spout adapter measures 1.80" in length and 1.12" in diameter.
     
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