Re-using Moen Valve Body

Discussion in 'Shower & Bathtub Forum & Blog' started by ianjt88, Apr 6, 2021.

  1. ianjt88

    ianjt88 New Member

    Joined:
    Apr 6, 2021
    Location:
    Idaho
    I am repiping my house to PEX from polyb. I have a bathtub (tub only) with a valve body that has polyb connections soldered in (see pic). I don't want to get a new valve body, but removing the connections is impossible because of the solder. Any options on reusing this valve body without buying a new one?

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  2. Terry

    Terry Administrator Staff Member

    Joined:
    Aug 17, 2004
    Occupation:
    Plumber
    Location:
    Bothell, Washington
    Wow! Just toss that old valve. They don't make good trims for that anymore. You can't use the PolyB connections either .

    If you repiping with PEX, you will want to run PEX to the new valve, making sure that the tub spout remains copper if you using a slip fit spout, or if it's a threaded spout, perhaps a drop ear 90 with a nipple pointing out for a spout. Brass and not galvanized.
    Galvanized gives you a little bit of rusty water every morning, brass doesn't and a copper slip fit doesn't either.

    The old Moen valve you have hasn't been a legal valve in decades. The new ones are either pressure balanced or Thermostatic to prevent temperature swings.

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    Last edited: Apr 6, 2021
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  4. Tuttles Revenge

    Tuttles Revenge In the Trades

    Joined:
    Oct 15, 2014
    What Terry said..

    But if you want to keep polishing a turd... You could remove the cartridge out and heat up the threaded adapters with a torch and thread them out.. then maybe if you're lucky the solder would be out of the threads you could thread in new.. or perhaps you could get a very small wire brush and while the solder is still wet, wipe it out... a few times cuz it won't be. Then you can try to thread in new adapters for PEX and pressure test that to see if all that work paid off..
     
  5. ianjt88

    ianjt88 New Member

    Joined:
    Apr 6, 2021
    Location:
    Idaho
    Thanks for the responses. Any suggestions on a replacement valve that doesn't break the bank?
     
  6. Tuttles Revenge

    Tuttles Revenge In the Trades

    Joined:
    Oct 15, 2014
    A new Moen Positemp or Delta Universal are both great valves with many economical trim kits.
     
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