ARKSEN R134a HVAC A/C Refrigeration Kit plus 4CFM 1/3HP Vacuum Pump Oil viewing windows allows you to monitor oil quality and levels Built-in high volume cooling fan for extended use Manifold: Operating Pressure: 600 PSI, Burst Pressure: 3000 PSI Manifold r134a: Quick disconnect couplers for high/low fittings included Free Air Displacement: 4 CFM, Power: 1/3HP, Pump Speed: 1720 RPM, Voltage 110V @ 60hz