Item "E" shown in the illustration is used in the hydraulic circuit as __________. GS-0103

Correct Answer: Option B — the manually operated pump located in a common passage way to close the water tight door in an emergency

Manually operated hydraulic pumps are required by 46 CFR for emergency operation of watertight doors. These pumps are located in accessible passageways, allowing crew members to manually close the door from either side of the bulkhead if the primary electric power or motor-driven pump fails during an emergency.