supply valve corrosion at compression connection

Discussion in 'Toilet Forum discussions' started by Ry, Jan 27, 2008.

  1. Ry

    Ry New Member

    Jan 26, 2008
    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. Mike Swearingen

    Mike Swearingen New Member

    Jan 12, 2005
    Independent Real Estate Broker
    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!
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  4. srdenny

    srdenny Plumbing Contractor

    Sep 11, 2004
    Plumbing Contractor
    SF Peninsula
    It could also be caused by condensation forming and drying on the valve and riser.
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