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Thread: Replacing Dishwasher: Can't turn off supply valve!

  1. #1

    Default Replacing Dishwasher: Can't turn off supply valve!

    I need help again guys. I am trying to replace a dishwasher. At the same time I am also installing a supply line for my ice maker/water dispenser. I will be using an adaptor for the ice maker/water dispenser line. At the very first step, I am already stuck. I dunno whats going on but I can't turn off my supply valve. It is so hard and won't turn even for a bit. I don't want to force it and make matters worse. What can I do to fix this without having to replace the supply valve itself? Can I spray some WD40 into it? TIA
    Last edited by thegoldenhand; 05-29-2006 at 11:14 PM. Reason: wrong spelling

  2. #2
    Forum Admin, Expert Plumber Terry's Avatar
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    Aug 2004
    Bothell, Washington
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    You can try something like oil, but if it's old, it may be time to change it.

    In some codes, if there is a check valve or PRV in the system, you will need a hammer arrestor at the dishwasher and the icemaker.

  3. #3
    In the Trades Gary Swart's Avatar
    Join Date
    Sep 2004
    Yakima WA


    I would trash that adapter and install a real valve and reducer adapters to the ice maker. Those adapter things seem simple enough, but they tend to go bonkers after awhile. As far as the other problem, replace the valve.

  4. #4


    I currently have 3 supply valves under my kitchen sink. First 2 is for the hot and cold of the kitchen faucet. The other 1 is used exclusively for the dishwasher. Is this a hot water or cold water line? What does dishwashers normally use?

    Coz if it's hot, then it's not where I will have to connect the adapter for my fridge ice maker/water dispenser line. I will have to connect it to the cold water supply valve that is currently being used by the faucet.

    Anybody know? Hot or cold? Thanks!

  5. #5


    The dishwasher is to be supplied with hot water.

  6. #6
    Retired Defense Industry Engineer jadnashua's Avatar
    Join Date
    Sep 2004
    New England


    I've got 4 shutoffs under my sink, H+C for the faucet, a cold for a filter, and a hot for the dishwasher. A bunch of t's...

    What might be simpler, if it is acceptable to you, is to replace the single outlet valves there now with double valves (these have two outlets rather than the more normal one). Hassle is, you lose the supply to the sink when you need to turn the thing off. Benefit is, you don't need a new T and pipe.

    I actually built my cabinets up on a 3" pedestal to make the counter higher...I ran the tubing for the DW and fridge under it, but behind the cabinet, below the floor of the cabinet against the wall should work fine.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014


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