๐ Cordless vacuum pump for air purge during installation of room air conditioner ๐ Removes all air from refrigerant tubing to create a vacuum environment before the tubing is charged with refrigerant gas ๐ Long run time of 50 minutes with a fully charged BL1850B ๐ Compression type: Oil rotary type (vane type), Single stage ๐ Easy to carry with a compact and lightweight body ๐ Built-in metal mesh filter minimizes vacuum pump oil from scattering from exhaust port ๐ Drain port with valve allows for easy change of vacuum oil pump ๐Valve minimizes securely oil back flow ๐ Convenient in places where AC outlet is not available