I don’t know why, but this big complex pipe structure was situated above the urinal. When you flush, the red light goes off and the green light goes on, and all the pressure dials start going crazy.
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Commonly referred to as the Mark One Able. It took 5+ people to operate and all inputs were via hand cranks. This one was on a Garcia class Destroyer Escort/Fast Frigate. en.wikipedia.org/…/Mark_I_Fire_Control_Computer