HQRP 2-Pack Flat Air Filter Cartridge for Briggs & Stratton 491588S / 491588/5043 / 399959/4101 Replacement Coaster HQRP&reg; Flat Air Filter Cartridge plus HQRP&reg; Coaster; This air filter is a commonly used part for small engines installed on lawn and garden equipment; Helps to eliminate dirt, dust and debris from contaminating the carburetor and damaging the engine; Dimensions: 4 1/2 " x 5 1/4" x 1". Replaces Briggs & Stratton #(s) 491588, 491588S, 399959, 4101, 5043B, 5043D, 5043H; John Deere #(s) PT15853, LG491588JD; Toro #(s) 119-1909; Craftsman: 33644 / 3364; Can be cleaned a time or two by using an air supply. But it is advised to replace it once it becomes dirty; Compatible with Original filter; 2 weeks DOA replacement warranty!