Fill nearly any aviation oxygen system with this multi-cylinder cascade filling station. The standard system configuration comes with three fillers adapters, control regulator, and safety bleed valve. The standard CGA540 nut at the end of the line will fill most portable oxygen systems. Simply screw either adapter into the CGA540 nut to adapt to nearly any system on the market. Choose options below for the number of supply bottles in your cascade (2-5), and Control Regulator delete, and bleed valve delete if desired.