The Shop-Vac® CleanStream® High Efficiency Cartridge Filter is a made of special material that maintains suction power even when used with fine debris like drywall dust! The exclusive nonstick surface resists clogging. It fits Craftsman® and Ridgid® brand wet/dry vacs. This product is manufactured by Shop-Vac Corporation. This is NOT a product of, nor is it sponsored or endorsed by RIDGID, Inc. Ridgid® is a registered trademark of RIDGID, Inc. Craftsman® is a registered trademark of KCD IP, LLC., a subsidiary of Sears Holdings Inc. CleanStream® is a registered trademark of W. L. Gore and Associates, Inc.