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The multiple pneumatic coupling balcony.

Picture 2 of 3.

A connector on the launcher would attach here to provide various pneumatic-related inputs:

From left to right, the pneumatic coupling lines are

• Injector purge (empty hole at left)
• Alcohol bubbling line
• Liquid oxygen replenishing control
• Igniter alcohol
• Liquid oxygen tank pressure
• Liquid oxygen vent control
• Liquid oxygen sensing
• High pressure fill
• Alcohol seal drain (empty hole at right)