This is the replacement Hoover ZVac WindTunnel Canister primary cartridge filter designed for the Hoover Windtunnel Bagless Canister vacuums. The Hoover ZVac WindTunnel Canister Filter replaces the OEM part number 59134033. This innovative primary replacement Hoover ZVac WindTunnel Canister Filter features an engineered to provide the highest in performance filtration and because of the fan folded design is less airflow restrictive, thus maximizing suction power. Consumers will find that the ZVac brand Hoover WindTunnel Canister primary cartridge filter easily installs and consists of superior, earth friendly quality.