Under Sink Shut-off Valves

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by marshallized, Oct 11, 2009.

  1. marshallized

    marshallized New Member

    Messages:
    3
    Location:
    Crestwood, IL
    Hi,
    When choosing a shut-off valve I see the outlet connection comes in either an 3/8" or 1/2" connection. How do I choose which one to get?. Is their any reason to choose one over the other?
  2. nhmaster

    nhmaster Master Plumber

    Messages:
    3,189
    Location:
    S. Maine
    depends on the faucet inlet size
  3. Terry

    Terry Administrator Staff Member

    Messages:
    15,280
    Location:
    Bothell, Washington
    We mostly use 3/8" compression stops on the outlet side.
    My supplier doesn't stock 1/2" IP stops and a few 1/2 compression stops.

    [​IMG]
  4. jimbo

    jimbo Plumber

    Messages:
    8,997
    Location:
    San Diego
    The sizes available include 3/8 and 1/2 flare, 3/8, 7/16, and 1/2 compression, and 7/16 + 1/2 slip joint=1/2 ips thread. Valves and supply lines are available in all of those. BUT....the trade has widely settled on 3/8 compression as the size of choice. Since the actual flex supply tubes are pretty much all the same ID, there is no practical reason to use a larger size fitting if you are starting all new.

    Because of this de-facto standardization, there is the widest availability of valves, lines, accessories, adapters,etc. in 3/8 compression. Any other size, choices are limited and harder to find.
  5. marshallized

    marshallized New Member

    Messages:
    3
    Location:
    Crestwood, IL
    Thanks for the replies,

    Sometimes it seem like when doing a simple project their are to many options available to accomplish the same thing.
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