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filler cap

noun
1.
a device sealing the filling pipe to the petrol tank in a motor vehicle
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Examples from the Web for filler cap
Historical Examples
  • If there is no hole in the filler cap, the latter should not be screwed down so tightly that an airtight joint will be formed.

    The Gasoline Motor Harold Whiting Slauson

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