Which stop valve do I use?

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by PM5K, Aug 9, 2008.

  1. PM5K

    PM5K New Member

    Messages:
    154
    Location:
    San Antonio, TX
    This question is in regards to stop valves for a bathroom sink.

    I'm used to seeing either one of the following:

    Copper supply, use compression fitting

    Galvanized Steel, use threaded fitting

    The current configuration is a copper supply with a threaded brass (can't be copper right?) end soldered on.

    So what exactly do I do with this, buy a threaded brass stop valve?

    Thanks in advance!
  2. TMB9862

    TMB9862 New Member

    Messages:
    206
    Use a 3/8" or 1/2" IPS by 3/8 compression valve. Brass and copper pipe threads are the same size as iron pipe threads.
  3. PM5K

    PM5K New Member

    Messages:
    154
    Location:
    San Antonio, TX
    I didn't think I could use a compression valve.

    Here is what they look like for the record, although this isn't the one in question, it's the same:

    [​IMG]
  4. Cass

    Cass Plumber

    Messages:
    5,980
    Location:
    Ohio
    It appears that you have a 1/2" copper male adapter...you will use a 1/2" IPS X 3/8" compression angel stop and I would suggest a 1/4 turn stop. Use Teflon tape on the threads.
  5. PM5K

    PM5K New Member

    Messages:
    154
    Location:
    San Antonio, TX
    Does it have to be 1/2" IPS X 3/8" compression

    Or can it be 1/2" IPS X 3/8" something else ?
  6. Redwood

    Redwood Master Plumber

    Messages:
    7,450
    Location:
    Connecticut
    3/8" compression is probably the most commonly used size outlet for faucets, dishwashers, and toilets. 1/4" compression would be used for icemakers, point of use water filters, and hot water dispensers.

    What do you have in mind?
  7. nhmaster

    nhmaster Master Plumber

    Messages:
    3,189
    Location:
    S. Maine
    Don't forget to get left and right handed valves:D
  8. Redwood

    Redwood Master Plumber

    Messages:
    7,450
    Location:
    Connecticut
    And call NH Master to borrow his left handed pipe wrench too!
  9. nhmaster

    nhmaster Master Plumber

    Messages:
    3,189
    Location:
    S. Maine
    sorry I'm busy right now sorting out a box of left and right 16D galvanized spikes.
  10. PM5K

    PM5K New Member

    Messages:
    154
    Location:
    San Antonio, TX
    Can you use a stop valve with a compression outlet by just screwing braided stainless supply line into it OR say using a copper or chrome plate supply line that's put on via a compression fitting, or is a compression stop valve only meant to be use one way?
    Last edited by a moderator: Aug 10, 2008
  11. Redwood

    Redwood Master Plumber

    Messages:
    7,450
    Location:
    Connecticut
    Use this type of connector it will thread right onto the valve. The one shown below is for toilets.

    Note: Do Not Buy the the Watts Floodsafe Connectors that big orange box pushes.

    [​IMG]
    Last edited: Aug 10, 2008
  12. Ian Gills

    Ian Gills Senior Robin Hood Guy

    Messages:
    2,777
    Location:
    USA
    If any of you would like me to go to the storeroom and ask the bloke there for a left-handed anything, then please let me know.
  13. PM5K

    PM5K New Member

    Messages:
    154
    Location:
    San Antonio, TX
    Thanks, sorry for being such a noob, I've actually done this a few times before, but I saw what I was expecting to see, this time I didn't.

    What's this left hand joke?

    :)
  14. Redwood

    Redwood Master Plumber

    Messages:
    7,450
    Location:
    Connecticut
    Phew, glad you recognized the joke!
  15. PM5K

    PM5K New Member

    Messages:
    154
    Location:
    San Antonio, TX
    I didn't, but since you helped I don't mind you guys having fun at my expense...
  16. nhmaster

    nhmaster Master Plumber

    Messages:
    3,189
    Location:
    S. Maine
    It's something we like to do to apprentices. Send them to the truck for a left hand pipe wrench, then wait to see how long they are gone. It carries over to all the trades.
  17. rpaquet

    rpaquet New Member

    Messages:
    6
    That fitting in the previous picture shows a similar type on a new shower valve I put in. I just got around to checking today and I have some leaks. I used teflon tape. Will the leaks stop eventually?
  18. Terry

    Terry Administrator Staff Member

    Messages:
    15,416
    Location:
    Bothell, Washington
    Doubtful.
    I would pull them and reinstall.
  19. Redwood

    Redwood Master Plumber

    Messages:
    7,450
    Location:
    Connecticut
    You used a connector like the one I pictured above to install a shower valve?

    The one I pictured is for a toilet! It is not supposed to be used inside a wall.
    The leak will not stop thats pretty much guaranteed...
    Can you post a picture of it?
  20. Terry

    Terry Administrator Staff Member

    Messages:
    15,416
    Location:
    Bothell, Washington
    A flex connector?
    No way.

    And you can't use tape with connectors. The tape will prevent it from sealing.
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