The earlier versions of the SP balanced inflator also used that same QD-I like it for it's high flow capability and ease of service. If the OP ( @mattspiral8 ) is interested in an AIR 2 I might have a rebuilt one for sale. I probably have a balanced inflator that is compatible with that fitting too.
One good thing about that hose and fitting assembly is the fitting can be removed and replaced with a standard inflator q.d. DGX Adapter: Turns LP Reg Hose into BC Inflator Hose | Dive Gear Express®
