The Yard Machines Gas Push Lawn Mower gets the job done in a quiet and effective manner with unmatchable power. This gas-powered equipment is designed for heavy-duty work and features a wear-resistant, cast-iron cylinder sleeve. The 20 in lawn mower with side discharge is best suited for small to medium flat lawns. It redistributes the cut grass as nutrients as it trims. Change the length of your lawn to suit your landscaping goals by manipulating the manual height adjustment to three different measurements.