(206) 949-5683, Top Rated Plumber, Seattle
Results 1 to 11 of 11

Thread: 3 handle valve to single handle valve question.

  1. #1
    DIY Junior Member
    Join Date
    Feb 2007
    Location
    little rock
    Posts
    18

    Default 3 handle valve to single handle valve question.

    I have a 3 handle valve in a tiled tub/shower and want to update to a single handle valve. The existing drop from valve to tub spout is only about 5" and Delta calls for an 8" drop. If I move the valve up to create the proper drop, the adapter plate won't cover the 3 handle holes in the tile. Is there a way to compensate for the less than minimum drop that is reliable/legit?
    Craig

  2. #2
    Master Plumber Dunbar Plumbing's Avatar
    Join Date
    Apr 2005
    Location
    Northern Kentucky/Greater Cincinnati Area
    Posts
    2,943

    Default

    I've set countless valves without that minimum without error or callback, but I prefer to follow mfg. specs whenever possible.


    The piping between the tub spout and the showerhead must be copper piping.

  3. #3
    Moderator & Master Plumber hj's Avatar
    Join Date
    Aug 2004
    Location
    Cave Creek, Arizona
    Posts
    25,673

    Default valve

    That 6" dimension was decided upon by an engineer who had absolutely no idea why it had to be that way. Maybe because he read some book published in 1940 that specified that dimension. If the trim ring on the new valve does not hit the spout, do it the way you have to.

  4. #4
    DIY Senior Member TedL's Avatar
    Join Date
    Sep 2006
    Location
    NY Capital District
    Posts
    604

    Default

    Just guessing, but if you're using something based on Delta's "universal" valve, that spec may be to cover any possible trim they may intoduce at some time unknown, which could include trims that need that much space to avoid the handle trim meeting the tub spout.

  5. #5
    DIY Junior Member
    Join Date
    Feb 2007
    Location
    little rock
    Posts
    18

    Default

    Thanks for the comments. Delta said the 8" minimum drop is so water won't back up and dribble out the shower head when filling the tub. If the 5" drop isn't enough, I've wasted time & money on a new valve. The old tile can't be matched to patch existing holes if I move the single handle valve up. What do I do if I get the dribble on the 5" drop?
    Craig

  6. #6
    Plunger/TurdPuncher kingsotall's Avatar
    Join Date
    Aug 2008
    Location
    Flagstaff, AZ Sitting on an upside down 5 gallon bucket next to the GO 68HD
    Posts
    1,260

    Default

    You'll have an understanding of why it does that and maybe could possibly live with it. Some people call these things giving a house character.

  7. #7
    Moderator & Master Plumber hj's Avatar
    Join Date
    Aug 2004
    Location
    Cave Creek, Arizona
    Posts
    25,673

    Default dribble

    You might get a "dribble" if the pipe were LONGER than 8", but almost impossible when it is less. The dribble is caused by back pressure and the longer, or smaller diameter, the drop the more back pressure is created.

  8. #8
    DIY Junior Member
    Join Date
    Feb 2007
    Location
    little rock
    Posts
    18

    Default

    Apparently, Delta agrees the drop can be too much. They advise the drop from valve to spout be 8"-18" to avoid "shower-rise". First, I've got to figure out if the cover plate will fit above the new spout and still cover the existing holes. Even with your encouraging comments, it feels like a leap of faith with the existing drop being so far outside the recommended range.
    Craig

  9. #9
    Forum Admin, Expert Plumber Terry's Avatar
    Join Date
    Aug 2004
    Location
    Bothell, Washington
    Posts
    14,209
    Blog Entries
    1

    Default

    If the tub spout doesn't hit the "pie pan" you should be fine.

    It's a common replacement for us plumbers.

  10. #10
    Moderator & Master Plumber hj's Avatar
    Join Date
    Aug 2004
    Location
    Cave Creek, Arizona
    Posts
    25,673

    Default drop

    You are placing "way, way" too much faith in the intelligence of an engineer. They deal in theory which they seldom test. We deal in actuality which we test daily.

  11. #11
    DIY Junior Member
    Join Date
    Feb 2007
    Location
    little rock
    Posts
    18

    Default

    I like your conviction. I need to check for the clearance issue and go from there.
    Craig

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
  •