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 five 1/4" Allen bolts mounted to the face with one behind the decal. There is also a 5/32" 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