Manifold Gauge Set Combo 4 CFM Air Vacuum Pump HVAC + R134A Kit AC A/C. Vacuum Pump Specification: Material: rubber, ABS Blue pressure gauge (low): 0-350 PSI, Red pressure gauge (high): 0-500 PSI. Super strong hose, breaking pressure is 3000PSI, Maximum working pressure: 600PSI. An unpaid case will be filled after 4 days.