The automatic adjusting wipers remove the tramp oil from die disk, allowing it to run off into a separate container. Since the coolant lacks adhesive qualities, it remains in the sump. This simple device can effectively remove six gallons per hour. It's design allows it to be mounted to any side of a sump where there is no direct spray of coolant, and where there is about 14x2 inches of space. The rotating disk needs to be immersed 1-3 inches in the coolant. Our sump skimmer is also available with 16", 18", and, 24" poly wheels. It is constructed of a steel frame, steel motor box , durable Dayton motor, eight foot cord, and 12" aluminum wheel, UL listed or approved electric cord. We present this machine to help you continue to get the most for your coolant dollars. Backed up by our standing service and satisfaction policy.