5-LAYER FILTER: HEPA replacement filter fits RIDGID 5-20 gallon dry and wet vacuums, perfect for eliminating all types of for cleaner indoor air PLEATED DESIGN: Increased surface area resists clogging and enables efficient capture, removing 99% of all particles 1/2 micron and larger from the air EASY TO CLEAN: For convenient maintenance, simply wash with water, dry it off, snap it onto the vacuum, and it's ready to be used again QWIK LOCK FILTER FASTENING MECHANISM: Allows for easy installation and removal, push down to install into the vacuum and pull up to remove