... .3. Double air pressure switch. Switch 1, low pressure auto stop switch, for airbrush purpose. Switch 2, high pressure none stop switch, for other high ... HPSpeed: 1450/1700 r.p.mAir output per min./liters: 20~23L/minDouble switch: switch 1: Auto start at 3BAR(43PSI), auto stop ... at 4BAR(57PSI) switch 2: Max pressure at 6BAR(86PSI), not auto stop.Working ...