Three magnet casings are adjustably and removably attached to one another such that the device may snuggly fit about fluid conduits of differing diameters. An outer casing wall of ferrous content stainless steel confines the magnetic field. An inner magnet holder frame attached to the outer casing wall holds a magnet to the conduit and is fabricated of non-ferrous stainless steel to allow maximum trans mission of the magnetic field to the fluid in the non-ferrous section of the conduit around which the casings are attached together.