A method and system for replacing used oil in a vat, the system including a nozzle having inner and outer concentric passageways, the outer passageway being connected to a supply of replacement oil, pumps associated with each of the inner and outer passageways, with a valve structure and a nozzle, the valve structure having biasing means. A movably arranged piston is provided in each cylinder is connected to a crankshaft. A database stored in a storage device is then updated with the extracted data to obtain an updated database. The fishing lure is adapted to be inserted into bait. The diffusing transflector comprises a diffusing element and a transflective element. When the plunger is not actuated, the movable element may contact the plunger and enter the passage, thereby attaching the cover to the rotor.