Hayward PoolVac V-Flex™ HSC925CCB Concrete Builder delivers more power, reliability and performance than ever. Equipped with patented V-Flex variable vane turbine technology, PoolVac V-Flex can pick up larger dirt and debris more effectively than any other cleaner on the market for peace of mind of clog-free cleaning. It maximizes suction power even at lower flow-making it the perfect partner for use with variable speed pumps. Its unmatched patented AquaPilot® programmed steering determines the most efficient cleaning path around any pool and assists with cleaner maneuverability for the most reliable, complete pool coverage.