... .Brass material 2.Negative pressure up to 635mmHg 3.Many brake bleeder joints and tubes are included 4.Blow case pacakge 1.Solid brass ... ,rubber piston rings and valves.3.Precise pressure gauge:0-30inHg,0-760mmHg.4.Negative pressure up to 635mmHg.5.Steel handle.6 ... ,to be widely used in auto repair,leak tests,experiments,vacuum packaging and so on. Brass Negative pressure Hand Vacuum Pump TS8001