PB 3342511 Synthetic Hopper Air Filter for Minuteman Power Boss Core 50, 5550. Water washable, spun-bond polypropylene hopper air filter. These upgraded poly air filters have the advantage over their cellulose (paper) counterparts in that they can be removed and washed with water. Not only can you use compressed air on these tough poly media filters, you can remove dirt with a flow of hot or cold water (be sure to completely dry synthetic filters before reinstallation to prevent clogging). Measures 15 x 30". Fits Hako Minuteman Power Boss Core 50 Series, 5500 Series and Hako 1800 Series sweepers and sweeper/scrubbers. One hopper filter required per unit. Priced Each. Replaces Hako Minuteman PowerBoss 3342511. Our Part Number PB 3342511