The Pressure Garment Assembly of the A7L Apollo Extravehicular Mobility Unit (EMU) was in many ways not so much a "spacesuit" as a small spacecraft in its own right. Custom manufactured for each astronaut and only used once, the PGA acted as a multi-layered shield against the harshness of space -- providing the astronaut with his own self-contained atmosphere while at the same time allowing access to fresh oxygen, water, power and communications.

The Torso Limb Suit Assembly (TLSA) portion of the PGA contained a series of color-coded connectors for various life-support and electronics umbilical lines. The BLUE umbilical connectors brought something TO the suit; the RED connectors took something OUT. The six-point connector on the A7L represented (from perspective of wearer):

Upper Right : Communications IN
Middle Right : Oxygen IN (from Oxygen Purge System)
Lower Right : Pressure Relief Valve

Upper Left : Oxygen IN (from Portable Life Support System)
Middle Left : Water IN/OUT (from Portable Life Support System)
Lower Left : CO2 OUT (to Portable Life Support System)

In addition to providing protection and environmental necessities, the PGA afforded the astronaut maximum freedom of movement under the unusual conditions of lunar extravehicular activity. The rear teflon abrasion patch was added to decrease friction between the PGA's exterior and the heavy Portable Life Support System (PLSS).