STIHL FS120 FS200 FS250 FS300 FS350 FR350 FR450 FR480 Replacement 4134120 0653 4134120 0603 Air Filter Kit Carburetor Air. Used to be durable and resistant to wear, shock and hard to get old. Long service life, excellent performance, no need for frequent replacement. Exquisite workmanship can effectively reduce fuel consumption, improve power and increase speed. Ensures durability and long-lasting performance. Practical and easy to use. Usage: It can be directly replaced and installed without complicated tools, saving valuable time. You need something equally practical.