Hook two water lines to one stop valve?

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by mc510, May 27, 2010.

  1. mc510

    mc510 Member

    Joined:
    Dec 18, 2009
    Location:
    California
    I've got an insinkerator instant hot to install in my kitchen; it uses a 3/8 compression fitting on its supply line. The cold water stop valve has one 3/8 compression fitting, which is, of course, being used by the faucet. So I need a way to get both of these 3/8 compression lines attached to the same stop valve.

    The Insinkerator manual advises to connect a tee to the existing stop valve, but I haven't been able to find an appropriate part for this application. All I can find is a 3/8 compression tee union, but it doesn't appear that a tee union can be directly threaded onto the existing stop valve. Does the sort of tee that I need exist (in common usage)?
     
  2. yngwie_69

    yngwie_69 New Member

    Joined:
    Sep 8, 2009
    Location:
    Prince Rupert, BC
    sounds like you need a chunk of 3/8th copper on the stop valve with compression nut, the hook the comp tee to the chunk of copper



    oh yeah they make a 2 way stop valve to, use them lots on the hot line for faucet and dishwasher
     
    Last edited: May 27, 2010
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  4. mc510

    mc510 Member

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    Dec 18, 2009
    Location:
    California
    That's what I was afraid of.

    Yeah, if I can't screw a tee right onto the existing stop, then a two-way stop is probably my solution. I just haven't yet looked to see how the existing stop connects to it's water supply.
     
  5. Terry

    Terry Administrator Staff Member

    Joined:
    Aug 17, 2004
    Occupation:
    Plumber
    Location:
    Bothell, Washington
    You should really replace the shutoff with a double stop.
    They make them 3/8" and 1/4" compression with two handles, for both IP and copper at the wall.

    [​IMG]

     
    Last edited: Feb 25, 2021
  6. mc510

    mc510 Member

    Joined:
    Dec 18, 2009
    Location:
    California
    Sounds good. The double-outlet stops that I've seen at the big chain stores all have plastic stems, which just seems like a bad idea ... or are these actually okay for home use?
     
  7. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Joined:
    Sep 2, 2004
    Occupation:
    Retired Systems engineer for defense industry.
    Location:
    New England
    A real plumbing store will have other choices, and then there is always the web. If you find a place that does free shipping, all the better. Note, your local Ace hardware probably either has, or can get what you want, and if you pick it up in the store (if they don't have it) you don't have to pay for shipping. Most order once a week, so it depends on when you hit that day how fast it will come.
     
  8. hj

    hj Master Plumber

    Joined:
    Aug 31, 2004
    Occupation:
    Plumber
    Location:
    Cave Creek, Arizona
    Most hardware stores will have a Brasscraft "Add-a-Tee" which screws to your valve. They come with 3/8" or 1/4" openings. Does your ISE have a 3/8" or 1/4" feed?
     
  9. mc510

    mc510 Member

    Joined:
    Dec 18, 2009
    Location:
    California
    thanks guys; i was able to find the dual outlet stop valve at my local Ace Hardware, just as jadnashua said ... 1/4 turn type, with brass ball and stem, made by Keeney ... and cheaper than the half-plastic Brasscraft valves at Home Depot!
     
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