Billy Goat PL2501SPV Hydro Drive AeratorFor the best combination of productivity, operator comfort, superior aeration results, variable hole density and remarkably low maintenance in its class, consider Billy Goats 25" 64 cm Hydro Drive aerator. The unit can aerate up to 4. 000m2 per hour. Best in class controls offer the same intuitive, variable speed fingertip hydro drive innovation as found on the reliable Billy Goat hydrodrive Brush Cutter, Overseeder and Sod Cutter. Billy Goats Patent