Lawn mower engine air filter and foam pre-cleaner set supersedes for & Stratton part number of 591334, 796031, 594201, 5428K, 5428, 5421 and part number of MIU14395, MIU13038, GY21435, MIU13963 Constructed with premium pleated filter paper, rubber and metal materials for an extended life and provide superior protection against the destructive effects of dirt ingestion, also can save on costly parts but has the same proper fit and performance as parts Many engine performance problems can be linked to maintenance issues such as stale fuel, dirty air filter, fouled spark plug and deteriorated oil. At least once a year you should replace the spark plug, clean or replace air filter, and check blades and belts for wear. A new spark plug and filter assure proper air-fuel mixture and help your engine run better and last . Compatibility: 1. Replace part number of for & Stratton 591334, 796031, 594201, 5428K, 5428, 5421 MIU14395, MIU13038, GY21435, MIU13963 30-851 13644 7-08242 102-012 2. Fits select for & Stratton model 31 & 40 & 44 engines using round canister style air filter 31A507, 31A607, 31A677, 31A707, 31A807, 31C707, 31E577, 31E607, 31E677, 31E777, 31G777, 401500, 405500, 406700, 407700,40N700,40N800,40R500,40R600, 40R700,40R800,445600,44N600,44N800, 44R500, 44R600, 44R700, 44R800 etc. including 13.5-19.5 Intek V-Twin engines and single cylinder OHV Vertical 17.5 engines 3. Some suitable lawn mower tractor model YTA22V46, YTH22V46, YTH24V48 riding lawn mowers - Lawn Tractor, 13WN77KS011, 13WN77KS211 YARDMAN 13AO785T055 mower etc. Color: yellow + black Material: plastic + sponge + metal Size about: about 12.7cm high; outer diameter 7.6cm Package Contents: 2pcs * Air filter element Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.