Performance tested to meet Robinair’s high standards this series of vacuum pumps have power and capacity for a wide range of service applications. This 4 cfm 115 volt, 2-stage design cleans the system more thoroughly than a single-stage pump and the 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. The oil fill port makes adding oil simple since the port is accessible from the front or either side. The sight glass on the front of the pump shows you when enough oil has been added. Heavy-duty motor is high torque design for easy startup and efficient operation and a die-cast aluminum housing make the pumps lightweight but durable. This pump features a 1/2 inch ACME and 1/4 inch MFL intake fitting.