A magnetic filtration device for installing into an opening of a reservoir, including, but not limited to acting as a replacement to a standard drain plug commonly positioned at the bottom of the reservoir. The magnetic filtration device may attract and capture magnetic (ferromagnetic) particulate circulating throughout a mechanical system. Applications for the device include engines, motors, pumps, compressors, gear boxes, transmissions, hydraulic systems, fuel systems and generators. The magnetic filtration device may comprise a magnet core enclosed within a magnet casing, with additional rods affixed to and/or arranged around the magnet casing to alter the radius of the magnetic field.