DSH 4000S Trimmer is for tough cutting conditisons and intense use. Ready to start thanks to AlwaysOn switch. EasyStart starting system ensures smooth quick starts. Solid steel drive shaft offers strong smooth power transfer to gear head. Transparent fuel tank makes it easy to check levels. Powered by 40cc 2.0HP motor. 29.1 Fluid ounce fuel tank. 26mm Tube diameter. Solid steel 8mm drive shaft. Trimmer head: 5.1" EVO Tap & Go 0.95" line. 50-State CARB compliant.