๐ 4 CFM class cordless vacuum pump for air purge during installation of air conditioning systems ๐ Designed to purge large air conditioning systems which DVP180 cannot purge ๐ High power ･DVP181 adopts dual-stage compression method, which can generate vacuum level much higher than single-stage compression method of DVP180 ･This high power enables DVP181 to purge large air conditioning systems such as 20hp class industrial refrigerating showcases or air conditioners for office use ๐ Long run time of 60 minutes with a fully charged BL1860B x2, enough to complete most purging jobs ๐ Compression type: Oil-sealed rotary vane type, Dual-stage compression ๐ Check valve: Electromagnetic valve 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 Easy to carry with a compact and lightweight body ๐ Drain port with valve allows for easy change of vacuum oil pump ๐ Valve minimizes securely oil back flow ๐ Convenient in places where AC outlet is not available ๐ Battery guards minimize the possibility of battery damage even if the machine falls down ๐ Optional shoulder belt can be attached