The device shown in figure "A" of the illustration is used to __________. MO-0042

USCG Exam Illustration MO-0042
USCG Examination Diagram: Illustration MO-0042
Official USCG Answer & Rule Citation

Correct Answer: Option B — provide lubrication to the cylinder

Mechanical cylinder lubricators deliver metered quantities of high-purity alkaline oil through check valves directly to cylinder liner quills, ensuring boundary lubrication between piston rings and the liner wall.

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