Possible Functions of the Pulley System in the bathroom:
• Tank Access or Maintenance: If the hot water tank was mounted high inside the bathroom, this pulley could have been used to hoist or lower the tank lid, immersion heater, or even the entire tank for cleaning or replacement.
• Valve Stem Extension: It might have been part of a mechanical linkage—transmitting motion from the manual valve actuator to a higher or more remote part of the system.
It all suggests an electrically-heated domestic water system, which raises the question: How was water fed to houses on top of Fa Peng?
Was there a system of water collection on the roof?
Was there a pumping station on Cheung Chau?
From this video: 廢墟探險-長洲鬼屋
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