Robinair 15234 1.2 CFM Vacuum Pump 1.2 cfm 115 volt 2-stage design cleans the system more thoroughly than a single-stage pump Second stage starts pumping at a lower pressure so you can pull a deeper ultimate vacuum Oil drain valve is positioned at the bottom of the oil reservoir and angled for faster and more complete draining Heavy-Duty Motor is high torque design for easy startup and efficient operation Die-cast aluminum housing make the pumps lightweight but durable