Is this OK? rough in valve

Discussion in 'Shower & bathtub Forum & Blog' started by FJK, Jan 16, 2008.

  1. FJK

    FJK New Member

    Messages:
    73
    Location:
    Illinois
    I'm replacing an old, simple Moen tub/shower rough-in valve with a new Moen posi-temp valve. Due to space limitations of a vent pipe next to the rough-in valve, I need to come out of the cold side of the valve with a male/female 90° fitting (solder in). Is this OK? See image 15. Image 16 shows the new valve mocked up off the old valve's tub spout to indicate why I need to come out of the valve with a 90.
    Finally, image 12 shows the existing plumbing that has air hammer risers & the close proximity of the vent pipe I mentioned earlier. I plan on eliminating the risers when I install the new rough-in valve. Any comments or plumbing routing suggestions for image 12.
    Thanks, FJK

    Attached Files:

    Last edited: Jan 16, 2008
  2. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Messages:
    22,013
    Location:
    New England
    My unprofessional opinion, you'll be fine. Note, those air chambers typically become useless after a few months unless you shut off the water at the main, then open up the valves and drain the pipes. The air trapped there gradually gets absorbed. You shouldn't need them, but if you want a water hammer arrestor, put in a real one - they cost about $12 each at a big box store.
  3. Redwood

    Redwood Master Plumber

    Messages:
    7,450
    Location:
    Connecticut
    hammer arrestors cannot be buried in a wall!
  4. Bob NH

    Bob NH In the Trades

    Messages:
    3,317
    Location:
    New Hampshire
    Remove the internal parts of that valve before soldering. Should be nothing but metal in there when it's hot.
  5. Rancher

    Rancher Guest

    Seriously? Where else would you put them, my house passed inspection with them in the walls.

    Not trying to start an argument, just trying to learn for the next house.

    Rancher
  6. markts30

    markts30 Commercial Plumber

    Messages:
    630
    Location:
    Phoenix, AZ
    They can be placed in the wall but should be accessable for service/replacement... (access panel...)
  7. srdenny

    srdenny Plumbing Contractor

    Messages:
    361
    Location:
    SF Peninsula
    In some jurisdictions, a code approved arrestor can be buried if it's manufacturer's installation instructions say it can.
  8. Redwood

    Redwood Master Plumber

    Messages:
    7,450
    Location:
    Connecticut
    That is what I would do!
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