HomeA - DApag Goldach 2369 Air Master Blue The regulator AIR MASTER was produced by Apag Apparatebau A.G. Goldach. The regulator was produced in various colors and versions of 5 and 6 screws set for fixating the top and bottom parts. It is a upstream single stage double hose regulator. 1 of 8 Related 019 Air Master Blue 1169 Air Master Blue 1423 Air Master Yellow 1634 Air Master Yellow 1892 Air Master White