Craftsman & Ridgid Replacement Filter by Kopach Replacement Filter for Craftsman and Rigid Brand (1988 to present brand, 5gal+) Vacuums by Kopach Durable, Efficient, & Long Lasting Filters for Your Shop Vac Great for Everything from Home Floor Care to Construction Projects Replaces Craftsman Part # 9-17816 Replaces Ridgid Part # VF4000 (Requires Kopach Reversible Cap for assembly to Ridgid vacuums)