Hayward AquaNaut™ 400 W3PHS41CST 4 Wheel 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 4-wheel drive capability, all-terrain tires and adjustable roller skirt, AquaNaut 400 can expertly clean pools up to 20’ x 40’, including deep ends, without clogging or getting stuck.