HomeA - DApag Goldach 1892 Air Master White 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 29 Related #0605 – Hydro Twin #0894 Repro Label – Hydro Twin II #1.874G Seine Narquilé #13.213 #28.463 – NIB