Scubapro A.I.R. 2 Diaphragm, 1st Generation Part Number 21-009-009 New The diaphragm assembly offered here fits the Scubapro A.I.R. 2 First Generation only. The assembly includes the "S" logo foil decal in the center of the diaphragm. This diaphragm is new and has never been installed. Please review our other Scuba items offered.