#593260 Or #798452, Briggs & Stratton, Air Filter Cartridge, Fits On 550E, 550EX & 725EXI Vertical Shaft Engines, For Use On Brands Such As, Craftsman, Husqvarna, MTD Poulan Pro & Many Others Equipped With The Listed Engines, Do It Yourself Version Of Briggs Service Part #798452 Or 593260.