VF3500 3-Layer Fine Dust Cartridge Filter Replacement Part 26643 Compatible with RIDGID 3-4.5 Gallon Wet & Dry Portable Vacuums. The VF3500 3-Layer fine dust replacement filter features 3 layers of filtering material that captures particles too small to be seen by the naked eye. The pleated design offers a large surface area to trap superfine dust and dirt. Features: Captures 99% of all particles 1/2 micron and larger; Great for picking up cold fireplace ash, fine dust, and everyday dirt; Fits RIDGID vacuums 3 to 4.5 gallons; Enjoy easy installation thanks to the built-in filter plate; Fully washable and reusable. Specifications: Dimensions: 7.65 inches (width) x 5 inches (height) / 4.25 inches (inner diameter); Package contains: 1 (one) cartridge filter replacement; Replaces part # VF3500, 26643. Compatible with the following RIDGID 3 to 4.5-gallon wet/dry vacuums: WD3050, WD4070, WD4080, WD4522, 4000RV, 4500RV.