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The sign accompanying the PLSS.

It reads

Apollo Oxygen Purge System

• [Yellow Square] High Pressure Oxygen Subsystem
  Provides storage of oxygen to be used in the suit during emergency.
• [Green Square] Low Pressure Oxygen Subsystem
  Provides emergency oxygen to the suit for breathing, ventilation, and suit pressurization.

Apollo Portable Life Support System

• [Yellow Square] Primary Oxygen Subsystem
  Provides storage of oxygen to be used for breathing and suit pressurization.
• [Green Square] Oxygen Ventilation Circuit
  Provides cooled oxygen for suit ventilation and removes carbon dioxide from the suit.
• [Red Square] Feed Water Loop
  Provides expendable water to a heat exchanger (sublimator) where excess heat from the suit is exhausted into space.
• [Red-Orange Square] Auxiliary Feed Water Subsystem
  Provides an additional supply of feed water to be used when the primary supply is depleted.
• [Blue Square] Liquid Transport Loop
  Provides chilled water to the suit for body cooling.
• [Black Square] Drain Water Subsystem
  Provides removal and storage of perspiration from the oxygen ventilation circuit.
• [Brown Square] Electrical Subsystem
  Provides power for fan and pump motors, sensors, displays, and communications.