Pentair LL109PM Legend Platinum- Head Only- White/Gray Dual thrust jets provide maximum power for speed and suction so most pools are cleaned in just 1-3 hours Front-wheel drive and heavily treaded tires provide maximum traction on inclined surfaces to assure total pool wall and floor coverage Four wheel design prevents tipping (common with 3 wheel cleaners) for uninterrupted and unattended performance Large-capacity debris channel and huge intake throat easily pick up larger leaves and debris Head only, this automatic pool cleaner comes ready to connect into a female threaded 1-1/2 in. line