Briggs & Strattonair filter fits 3 and 5 HP horizontal engines 130200 series starting at type # 2915. Fits all 3.5 thru 6 HP Quantum engines. Size: 5-1/4" L x 4-1/2" W x 13/16" H. Use with our P/N 30-927 pre-filter for horizontal engines and P/N 30-961 pre-filter for vertical engines. Replaces OEM part numbers; 491588, 491588S, and 399959.