Hydrogen Gas Actuator (HGA)

This is the circular tube that resides at the top left part of the Proton Pack, just above the Gun Mount. It's purpose is unknown, but may coincide with the Crank Generator it's attached to. The HGA has four 1/4-20 socket head cap screws mounted to the face, and one 6-32 flat head screw that holds the metallic label in place. There is also a 4mm Legris elbow and a 1/8" Clippard brass barb and elbow (#15090 and #11752) mounted on the side: Bolt and fittings configuration can be seen here: http://www.gbfans.com/image.php?url=/images/equipment/plans/stefan_8.jpg