Hayward AquaNaut® 200 PHS21CST 2 Wheel Automatic Suction Cleaner. Patented V-Flex™ variable vane turbine technology handles larger debris without clogging and maximizes suction power at virtually any flow, making them ideal for use with variable speed pumps. With rugged, all-terrain tires and adjustable roller skirt, AquaNaut 200 can expertly clean pools up to 16’ x 32’, without clogging or getting stuck.