HIPA (Pack of 3) Replace Air Filter for STIHL FS40 FS50 FS56 FS70 FC56 FC70 KM56 HT56C Trimmer Brush Cutter # 4144 124 2800 Replacement manfacturer part number: 4144-124-2800 Fitment models: stihl FS40 FS40C FS50 FS50C FS50-L FS56 FS56R FS56C FS56RC FS70 FS70C FS70RC FC56C FC70C KM56 KM56R KM56C KM56RC HT56C trimmer Qty: 3pcs