ECHO's newest PAS system offering class-leading performance 25.4 cc professional-grade, 2-stroke engine for outstanding performance; Tool-less access allows for fast and easy in-field maintenance; Easy start-ability especially for re-starts in hot, dusty climates; Engine vibration reducing mounting absorbs engine vibration; Two-stage air filtration system dramatically increases cleaning capability and allows for longer maintenance intervals; Tool-less coupler allows for fast easy changes on multiple attachments; Large 20.6 fluid ounce fuel tank for extended run time between fill-ups; Not recommended for Curved Shaft Trimmer attachment;