OEM Carburetor / Walbro WT-38-1Pack Size:1Walbro WT-38B, Walbro WT-38-1, Walbro WT-38Green Line 44190, J. Thomas WT-38B, NHC 203-5095, Prime Line WWT-38-1, Rotary 11148Stihl most FS51-90 trimmers Not compatible with greater than 10% ethanol fuel