(206) 949-5683, Top Rated Plumber, Seattle
Results 1 to 7 of 7

Thread: shower valve torque specs for 1/2" solder fittings

  1. #1
    DIY Member rfsmith48's Avatar
    Join Date
    Feb 2008
    Location
    Colorado
    Posts
    40

    Default shower valve torque specs for 1/2" solder fittings

    So I am installing a new Kohler K304 shower valve.

    What torque value should I use for the 3 1/2" solder fittings, and the 1/2" cap for the tub outlet?

    TIA,

    Rog Smith

  2. #2
    Moderator & Master Plumber hj's Avatar
    Join Date
    Aug 2004
    Location
    Cave Creek, Arizona
    Posts
    25,653

    Default

    There is no such "value". You turn them until they are tight, or VERY tight.
    Licensed residential and commercial plumber

  3. #3
    Retired Defense Industry Engineer jadnashua's Avatar
    Join Date
    Sep 2004
    Location
    New England
    Posts
    21,405

    Default

    Most of those valves will accept either a directly soldered in pipe, or a female threaded fitting...pros almost always use the soldered connection. The threaded connection is made by jamming the threads with a sealant in between the male and female parts. It gets tighter (think wedge) the more you screw it in. It really depends on the quality of the fittings, and the type and quantity of sealant.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

  4. #4
    In the Trades Gary Swart's Avatar
    Join Date
    Sep 2004
    Location
    Yakima WA
    Posts
    7,246

    Default

    As previously stated, there are two ways to do this. You can sweat the pipe directly to the valve, but these is a risk involved, especially for a novice. Get the valve too hot and it's toasted. The second way, the safer way, is to sweat a male adapter to a short length of copper pipe. Then screw the adapter into the valve following HJ's suggestion. Tight or tighter and use some pipe dope. Now, you can sweat fittings on the other end of the copper pipe without overheating the valve. With little planning you won't have to make a second cut on those short pieces of pipe.

  5. #5
    Retired Defense Industry Engineer jadnashua's Avatar
    Join Date
    Sep 2004
    Location
    New England
    Posts
    21,405

    Default

    FWIW, pipe threads are not like torquing the head bolts or wheel bolts on a car where a specific torque can be determined to work...there's no gasket to compress...the threads are tapered and when tightening the fitting, you are literally jamming the male and female threads, not compressing two flat surfaces of a gasket. The sealing material must be applied properly, as the threads just make the mechanical connection, not the seal.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

  6. #6
    DIY Junior Member takatsu's Avatar
    Join Date
    Jan 2013
    Location
    Georgia
    Posts
    6

    Default

    Hi! I had the same experience. After two different types of pipe dope (a generic hardware store and a brand-name) leaking after a few hours or days, I took out the valve with female fitting and bought a valve with male fittings so I could solder it in place. Maybe some people can get dope to work correctly, but not me. Then I read on this forum that the big boxes sell female valves because they have to be used with dope/male pieces specifically to avoid soldering- consumers didn't take the plastic and rubber pieces out of the valves before soldering, melted them, and returned them to the store (who sent them back to the manufacturer). So the shower valve manufacturers passed their problems on to the consumer by only offering female valves in big box stores. Apparently, a plumber will take a male/solderable valve over a female/dope valve any day of the week. After my experience- me to. The original valve soldered into my shower when then house was built in 1980 looked much the same as I expect it did then when I opened the wall 30+ years later- no leaks and just a bit dusty.
    Paul Schultz

  7. #7
    Retired Defense Industry Engineer jadnashua's Avatar
    Join Date
    Sep 2004
    Location
    New England
    Posts
    21,405

    Default

    Many of the valves can be used either way...
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

Similar Threads

  1. Shower Valve Inst - Male Threaded fittings or Unions?
    By Remodelboy in forum Shower & bathtub Forum & Blog
    Replies: 1
    Last Post: 01-24-2008, 06:59 PM
  2. Measured torque on typical brass NPT fittings?
    By Tim222 in forum Plumbing Forum, Professional & DIY Advice, Tips & Tricks
    Replies: 1
    Last Post: 12-02-2007, 07:46 AM
  3. leaky moen posi temp shower valve fittings
    By billonion in forum Shower & bathtub Forum & Blog
    Replies: 3
    Last Post: 02-16-2007, 09:02 AM
  4. Rookie first time questions..."cleaning" the solder
    By coopns in forum Plumbing Forum, Professional & DIY Advice, Tips & Tricks
    Replies: 6
    Last Post: 10-30-2006, 06:38 AM
  5. Newbie question-can you solder fittings twice?
    By I love pizza in forum Plumbing Forum, Professional & DIY Advice, Tips & Tricks
    Replies: 5
    Last Post: 04-18-2006, 06:16 AM

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •