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Old 5th Mar 2014, 14:32
  #5258 (permalink)  
Smeagol
 
Join Date: Jun 2002
Location: ex-Abu Dhabi now back in Carrot Cruncher Land
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Descender thingy = Donut or equivalent

(pop DONUT into your favorite search engine)

Standard issue on many offshore oil & gas or windfarm installations.
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