Optimal Performance: your lawn mower operates at efficiency with our good-quality air filter . Designed specifically to fit for models 491588s and 399959, this replacement part is essential for maintaining intake and smooth engine operation. and Reliable: Crafted from advanced filter materials, our air filter cartridges are built to last, providing a reliable solution that keeps your push mower running smoothly throughout the season. Easy Installation: Replace your old or clogged air filter in minutes with our user-friendly design, tailored for quick and hassle-free installation. Keep your mower in top condition with minimal effort. Enhanced Engine Protection: Protect your engine from dirt and debris that can cause damage and reduce efficiency. Our filters clean airflow, extending the life of your mower. Universal Model Air Filter: For 491588s 491588 4915885 399959 push lawn mower, bs- 4101 5043 5043A 5043D 5043H 5043K. For 3.5- 6.5 For quantum small engine, 625 675 725 625-675 e/ex series element. Wide Use Parts: For Toro 20332 20334 20330, For , For , For Built walk behind lawn mower / tractor air filter. Replace part number of air cleaner. [Note: this item is not compatible with For engines, please check] Color: As Shown Material: plastic Package Contents: 12 x Lawn Mower Air Filter Only the above package content, other products are not included. Note: Light reflection 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.