Solo 451 3-Gallon 2-Stroke Gas Powered Backpack Mist Blower, Lightweight, Low Fuel Consumption Two-stroke 66.5 cc Solo engine Extra-large polymer impeller produces high air volume at a lower RPM, reducing fuel consumption and noise level Single multi-function operating handle Features easy start, anti-vibe system and padded backrest Chemical metering valve allows control of chemical usage Comfortable, backpack carrying frame and wide, padded carrying straps with click lock. Compact size, light weight.