Polaris P39 Pressure-Side In-Ground Pool Cleaner Powered by booster pump for maximum performance. EXTREME SWEEPING Includes TailSweep PRO for enhanced sweeping action blows debris out of corners and hard to reach places and eliminates spraying outside the pool. No more wet walkways and windows All wheel posidrive system with durable stainless steel drive chain delivers 50% more torque for quicker cleaning, better manueverablity and climbing, and fewer hang ups Dual chamber zippered superbag picks up and stores more debris for easier and less frequent cleaning Bonus comes with 3 extra tail scrubbers plus TailSweep pro