... air polluted. 3) Double air pressure switch. Product Name: Double Cylinder Airbrush CompressorModel AS19Brand HSENG Features1) Double cylinder, high air flow ... gauge. 4) Double air pressure switch.Switch 1, low pressure switch, for airbrush purpose.Switch 2, high pressure switch, for other high ... p.mAir output per min./liters: 35~40L/minDouble switch: switch 1: Auto stop, start at 3BAR(43psi), ...