Model # BS- 591334 796031 594201 797704 lawn genuine air filter, part # 5428K 5428 5421. Fit 31 vertical 13.5 for hp to 19.5 for hp and intek v-twins 16 for hp to 24 for hp engine. Fits select model 31 & 40 & 44 engines using round canister style air filter, including 13.5-19.5 for HP Intek V-Twin engines and single cylinder OHV Vertical 17.5 for HP engines.
