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Old 13th Mar 2007, 19:50
  #7 (permalink)  
Swedish Steve
 
Join Date: Apr 2005
Location: Stockholm Sweden
Age: 74
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These two valves only open on the ground! They are open at temps above about P2degC or so, depends on the wind.
Here in ARN we never see them open in the winter. It is a sign of spring when you hear the whoosh as they open.
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