A single fitting installed in a pipeline that either blanks off the pipe or allows a full flow passage of a liquid through the pipe is referred to as a __________.
Official USCG Answer & Rule Citation
Correct Answer: Option A — spectacle flange
A spectacle flange features both a solid blank disc and an open ring connected by a pivot. Swiveling the fitting allows an operator to either completely block pipeline flow or permit full passage.
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