Echo 13100455530Echo GT and SRM trimmers/brushcutters, PAS systems, PE power edgers, BRD bed refiners, PB powerblowers, ES shredders, HC, SHC, HCR and HCA hedge trimmers, PPF, PPFD, PPSR, PPT and SRS power pruners, ED, EDR, EA and TC engine drills, earth and ice augers and tillersOD: 1 7/8 ", Ethanol: Not compatible with greater than 10% ethanol fuel