Replacement TII1MCRN 1 Micron Vacuum Filter Features 1 Micron filter for Fein vacuums Mounts onto float valve cage on bottom of vacuum head Requires turn screw (TII3001) and flange (TII3002) for mounting Must be used with paper dust bag; do not use with cloth filter bag.Green Klean® Replacement filters use the highest quality filter media. Designed specifically for industrial use, they are always equal to, or exceed OEM quality. Better filtration means cleaner air, less dusting, and longer secondary filter life. Each container is printed to easily identify the vacuum it fits. Clean with Confidence, Replace with Green Klean.