ARKSEN Electric 2-Stage Rotary Vane Deep 1/3HP 3CFM AC Vacuum Pump R410 R134 HVAC with (Free Oil) Quickly and effectively removes moisture and air arom air conditioning system Lightweight cast aluminum construction for maximum durability Direct drive motor allowing easy starting and is maintenance free Oil viewing windows allows you to monitor oil quality and levels Vacuum pump is not only for air conditioning maintenance but can also be used for vacuum sealing jars for preserving food, degasification, hot-forming plastic, chemistry and stabilizing wood.