1. Compatibility: 1. It can replace D4 - 180I - B, D4 - 180I - C, D4 - 180I - D, D4 - 180I - E. 2. It can replace D4 - 210A - A, D4 - 210A - B, D4 - 210I - A, D4 - 210I - B. 3. It can replace D4 - 225A - B, D4 - 225A - C, D4 - 225A - D, D4 - 225A - E, D4 - 225I - B, D4 - 225I - C, D4 - 225I - D, D4 - 225I - E. 4. It can replace D4 - 260A - A, D4 - 260A - B, D4 - 260A - C, D4 - 260A - D, D4 - 260A - E, D4 - 260D - B, D4 - 260D - C, D4 - 260D - D, D4 - 260D - E, D4 - 260I - A, D4 - 260I - B, D4 - 260I - C, D4 - 260I - D, D4 - 260I - E. 5. It can replace D4 - 300A - A, D4 - 300A - C, D4 - 300A - D, D4 - 300A - E, D4 - 300D - A, D4 - 300D - C, D4 - 300D - D, D4 - 300D - E, D4 - 300I - A, D4 - 300I - C, D4 - 300I - D, D4 - 300I - E. 6. It can replace D6 - 280A - A, D6 - 280A - B, D6 - 280A - C, D6 - 280A - D, D6 - 280A - E, D6 - 280I - A, D6 - 280I - B, D6 - 280I - C, D6 - 280I - D, D6 - 280I - E. 7. It can replace D6 - 310A - A, D6 - 310A - B, D6 - 310A - C, D6 - 310A - D, D6 - 310A - E, D6 - 310D - B, D6 - 310D - C, D6 - 310I - A, D6 - 310I - B, D6 - 310I - C, D6 - 310I - D, D6 - 310I - E. 8. It can replace D6 - 330A - B, D6 - 330A - C, D6 - 330A - D, D6 - 330A - E, D6 - 330D - B, D6 - 330D - C, D6 - 330D - D, D6 - 330D - E, D6 - 330I - B, D6 - 330I - C, D6 - 330I - D, D6 - 330I - E. 9. It can replace D6 - 350A - A, D6 - 350A - B. 10. It can replace D6 - 370A - B, D6 - 370A - C, D6 - 370A - D, D6 - 370A - E, D6 - 370D - B, D6 - 370D - C, D6 - 370D - D, D6 - 370D - E, D6 - 370I - A, D6 - 370I - B, D6 - 370I - C, D6 - 370I - D, D6 - 370I - E. 11. It can replace D6 - 400A - E. 12. It can replace D6 - 435D - A, D6 - 435D - C, D6 - 435D - D, D6 - 435D - E, D6 - 435I - A, D6 - 435I - C, D6 - 435I - D, D6 - 435I - E. 13. It can replace D9A2A, D9 - 425, D9A2A, D9 - 500 (R4), D9A2A, D9 - 575, D9A2A, D9A - MG, D9A2A, D9A -. 14. It can replace D9A2B, D9 - 425, D9A2B, D9 - 500 (R5), D9A2B, D9 - 575, D9A2B. 15. It can replace D9A2C, D9A2D, D9A2E, D9A2F. 16. It can replace D9A2G, D9A2H, D9A2J, D9A2K. 17. It can replace D11A - A, D11A - B, D11A - C, D11A - D. 2. Features: 1. Reference numbers: 3818541, 3583654, 21702999. It can replace D4, D6, D9, D11 models. 2. It can effectively improve the engine's operating efficiency and purify and filter the air. 3. It can prevent harmful dust and debris from entering the engine's internal components and extend the engine's service life. 4. It is easy to install, requiring no complex tools, and can directly replace the old or damaged air filter. 5. It is manufactured according to compatibility, appearance, and functional requirements for easy use. 3. Specifications: - Item type: Air filter - Material: Filter paper - Length: 300 mm / 11.8 inches - Width: 240 mm / 9.4 inches - Thickness: 35 mm / 1.4 inches - Number: 3818541 / 3583654 / 21702999 - Replaceable Crom model: 117303 - Replaceable Orbitrade model: ORB17999 / 17999 - Color: White 4. Package contents: - 1 air filter. Only the above - mentioned package contents are included, and other items are not included. 5. Note: - Light reflection and different displays may cause the item's color to differ slightly from the actual object. The measurement tolerance is +/- 1 - 3 cm.