The Robinair Advantage lets you pump refrigeration oil into a system under pressure.

Features:

• Siphon hose makes it easy to remove old oil before adding new oil
• Mounts on a one-gallon container of refrigeration oil and pumps oil
  directly into the refrigeration system, keeping the oil free of moisture
• No need to remove pump from refrigerant container after each use
• When connected to the system, oil can be pumped at a rate of three
  ounces per stroke