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Thread: supply valve corrosion at compression connection

  1. #1

    Question supply valve corrosion at compression connection

    Early in 2007 I replaced shutoff valve and supply tube to upstairs toliet. Lately I have noticed a white powdery substance on the valve and tube where they connect also there is a greenish color at the compression fitting where the tube enters the valve. No moisture of any kind is currently present on the valve, tube or floor. It is possible at one time there was and now it has sealed its self. Do I need to do anything with this or is it ok?

  2. #2
    DIY Senior Member Mike Swearingen's Avatar
    Join Date
    Jan 2005
    On Albemarle Sound In Northeastern NC


    The white powdery substance is most likely calcium from hardness in the water and the green is the same thing from the copper.
    Clean off the discoloration with a little steel wool and carefully snug up the fittings, using a backup wrench.
    Good luck!

  3. #3
    Plumbing Contractor srdenny's Avatar
    Join Date
    Sep 2004
    SF Peninsula


    It could also be caused by condensation forming and drying on the valve and riser.


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