The Kirby Morgan Air Control System (KMACS 5) is a portable control box for use in surface supplied air diving operations. The KMACS 5 control the diver's air supply and comes with or without radio. It allows two divers clear push-to-talk (two wire) or "round robin" (four wire) communications.

The air supply can be either from a low pressure compressor or high-pressure cylinders. The KMACS 5's adjustable first stage regulator reduces the high-pressure air and supplies low pressure through the umbilical to the diver's breathing system. Low pressure air supply fittings allow for a L.P. compressor to be used as the primary air source.