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Esco Products, Inc. developed the 3-D BullsEye to make the job of a lubrication technician or maintenance manager easier when checking both color and clarity of the oil on small wet sump applications such as pumps and gearboxes while allowing an unobstructed 360° view of the oil level. The 3-D Bullseye Sight Glass and brass sight windows on oil reservoirs make it difficult to view the oil level, stain easily, and must be replaced often. The innovative design team at Esco improved upon the old-fashioned sight plug with the creation of a replacement sight window called the 3-D BullsEye.