Hand Held Vacuum and Pressure Pump Tester Kit + Brake Fluid Bleeder + Adapters Pro Quality Tool applies both Pressure and Vacuum by simply sliding the black collar Pressure to 40 PSI (3.1 bar) Vacuum to 20 inHG Slide black valve direction slider chamber forward toward connection barb for vacuum, slide back for pressure Test automotive vacuum systems with numerous included adapters and hoses Durable construction vacuum pump/brake bleeder in Form Fitted storage case