Moen shower valve install problems

Discussion in 'Shower & Bathtub Forum & Blog' started by Scout_800, Jun 9, 2008.

  1. Scout_800

    Scout_800 New Member

    Messages:
    3
    Location:
    Central NC
    Hi friends, I'm looking for some advice on installing a Moen shower valve (model #82355). This valve has threaded female inlets for the hot/cold lines and the same for the tub/shower outlets. I am using brass/cpvc male thread adaptors.

    Here's the problem: I installed the valve using teflon tape at all connectors and ran a pressure test. After a few minutes a bead of water appeared on the exposed threads of the hot inlet. Everywhere else was bone dry. So, I disconnected the hot, removed the tape, and used teflon joint thread compound (oatey). No go - more water this time. Ok, it must be the fitting. I get another fitting and try it with tape. Same leak. Try it with joint compound. Same leak.

    Ok, it must be the valve. So, I call Moen and to their great credit I had another valve in my hands the next day. Install with new fitting (+tape). Guess what? Another leak. Same place - hot inlet. All the other fittings hold perfectly well on both valves, so I sincerely doubt it is my technique. Plus, I've now tried three different fittings, so I doubt that is the problem.

    I called Moen back this morning and the only advice I got so far was to buy my fittings from a different store. Ummm... but the cold side doesn't leak. A product specialist is going to call back this afternoon. I can't see what they can do besides send another valve or refund my purchase price. We like the trim on this one, though (it is a matching set with the sink faucet), so I'd rather not go shopping for a new brand. The funny thing is that I specifically chose Moen for its reputation for quality.

    If anyone has a suggestion on how I can make this valve work I'd love to hear it. Or perhaps there is a high quality universal valve out there?

    Thanks

    Bill
  2. rombo

    rombo New Member

    Messages:
    62
    Location:
    Ontario
    are you using teflon tape and pipe dope together. If not try both not just one or the other
  3. Scout_800

    Scout_800 New Member

    Messages:
    3
    Location:
    Central NC
    I didn't know that was a possibility. I'll give it a try.

    bill
  4. rombo

    rombo New Member

    Messages:
    62
    Location:
    Ontario
    ya most of us plumbers always both use on any joints
  5. Redwood

    Redwood Master Plumber

    Messages:
    7,450
    Location:
    Connecticut
    Yep... Wrap on the teflon tape then goop on some teflon paste and screw it in tight.... Kinda like having a belt and suspenders!
  6. Scout_800

    Scout_800 New Member

    Messages:
    3
    Location:
    Central NC
    So far so good - thanks for the response guys.

    Bill
  7. hj

    hj Moderator & Master Plumber Staff Member

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    27,263
    Location:
    Cave Creek, Arizona
    tape and dope.

    Mkae that SOME of us plumbers, not MOST, because I think it is a very seldom used process, especially for everyday joints. And with it happening to so many different items, the only thing common to every try is the operator, so it could just be operator error.
  8. rombo

    rombo New Member

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    Location:
    Ontario
    Hj it must depend on where we work because i have never ever seen someone not use both unless it was a gas line, medical gases, ect....




    hope it worked out for you scout:)
  9. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    27,263
    Location:
    Cave Creek, Arizona
    joints

    I have NEVER used both and have not seen anyone in this area who does either.
  10. rombo

    rombo New Member

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    62
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    Ontario
    hmmm weird
  11. Terry

    Terry Administrator Staff Member

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    15,418
    Location:
    Bothell, Washington
    I'm like hj, I normally use one or the other.
    I seem to use Teflon pipe dope the most.
    Leaks? you gotta be kidding me. Doesn't happen.
  12. Mikey

    Mikey Aspiring Old Fart, EE, computer & networking geek

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    2,736
    Location:
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    Last edited: Jun 11, 2008
  13. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    27,263
    Location:
    Cave Creek, Arizona
    threads

    Why? Reading a few discussions about the pros and cons is not going to make any one change his mind about the way he/she has been doing it since year one.
  14. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Messages:
    22,324
    Location:
    New England
    Either method, pipe dope or teflon tape, should suffice on its own. The recommended wraps of teflon are based on a properly cut joint. Today's materials can often have lousy threads, which challenges the ability of tape to seal unless you use more, but there is a limit on how much you can use. If using dope, you need a sufficient quantity as well.

    Using both doesn't hurt and might give a DIY'er a little more leeway in getting a joint that doesn't leak. It takes a little skill to determine when enough is enough on sealer and how tight the joint needs to be.
  15. rombo

    rombo New Member

    Messages:
    62
    Location:
    Ontario
    When I was first learning the trade i was told the tape does the sealing and the dope was there to provide lubrication while tightening, and the extra leak protection was just an added bonus.
  16. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Messages:
    22,324
    Location:
    New England
    In my (limited) experience, teflon is plenty slippery by itself...no need for pipe dope for lubrication purposes.
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