Kitchen shutoff valve sizes

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by greekguy7, Feb 13, 2019.

  1. greekguy7

    greekguy7 Member

    Joined:
    Jul 1, 2005
    Location:
    Illinois
    Kitchen shutoff valve sizes
    Author: greekguy7 (IL)
    I went to put in a Moen faucet that had the supply lines already attached: 3/8" compression connection at the end of them which is very typical application.

    It turns out the shutoff valves I had in there were 1/2"compression on the end. Darn! Went to get some adapters to go from 1/2" compression to 3/8" compression and one of them dripped so I changed out the entire shutoff valve, and was on my way.

    You see a lot of shutoff valves in kitchen or baths that are 1/2"? Seems like most are 3/8". I think the reason the adapter leaked on one of them is because I was in a hurry and messed up the rubber o-ring that came with the adapter. Is that what makes the actual tight seal connection?
     
  2. Terry

    Terry Administrator Staff Member

    Joined:
    Aug 17, 2004
    Occupation:
    Plumber
    Location:
    Bothell, Washington
    Without seeing what you have, I can say that if there is an O-Ring there, they are used as seals.
    No tape is needed for those, or for compression connections.

    Many new faucets are coming with their own supplies made to fit 3/8" compression stops.
    This one below fits 1/2" copper (5/8" OD) with a 3/8" compression outlet.

    [​IMG]
     
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  4. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Joined:
    Sep 2, 2004
    Occupation:
    Retired Systems engineer for defense industry.
    Location:
    New England
    FWIW, in a home, a kitchen faucet is flow restricted, so 3/8" works fine.
     
  5. Reach4

    Reach4 Well-Known Member

    Joined:
    Sep 25, 2013
    Location:
    IL
    Now you have easier-to-operate stop valves. So nice upgrade.
     
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