HomeA - DApag Goldach 489 Air Master Purple 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 10 Related “V” Mouthpiece #09.325 De Luxe “V” Mouthpiece #09.943 De Luxe #03.159 #04.937 #05.779