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Old 31st Jul 2008, 05:41
  #781 (permalink)  
NSEU
 
Join Date: Feb 2004
Location: Australia
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The oxy cylinder valve knob is metal with a molded green plastic cover that could have left such a mark.
Actually, they appeared to be metal, painted with green paint. I opened and closed half a dozen of them last week

Thanks for the heads up on the valve.

Rgds.
NSEU
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