Part number: 4149 120 1800, 4149-120-1800, 41491201800. Compatible with Stihl models: FS23C-E, FS23C-E, FS23RC-E, FS23RC-E, FS23SC-E, FS23SC-E, FS24C-E, FS24C-E, FS24RC-E, FS24RC-E, FS24SC-E, FS24SC-E, FS25C-E, FS25C-E, FS26C-E, FS26C-E, FS26RC-E, FS26RC-E, FS26SC-E. Compatible with Stihl models: FS26SC-E, FS94C-E, FS94C-E, FS94RC-E, FS94RC-E, HL91KC-E, HL91KC-E, HL92C-E, HL92C-E, HL92KC-E, HL92KC-E, HL94C-E, HL94C-E, HL94KC-E, HL94KC-E. Enhanced Protection: High-quality foam material traps dust & debris, preventing engine damage for longer equipment life. Easy Installation: Simple drop-in replacement - no tools required for quick maintenance between jobs., Manufacturer: eMagTech