***This listing is for 1 Cap ONLY, it does NOT include the actual Filter*** This reversible cap allows the usage of the KoPach Filter same filter on two different brands of wet/dry vacs: Ridgid Craftsman. The cap will fit most models from 1988 to present vacuum cleaner that require a plate and nut for assembly. The Black cap is a requirement and a one time purchase for the Ridgid brand only. The cap when assembled to the filter low side down fits the Craftsman brand. With the cap dome up assembled to the filter this will allow assembly of this filter to the Ridgid models. The Black Cap is a reversible cap that allows the filter to fit two different brands of vacuum cleaners which are Ridgid Craftsman. The cap can be used as a replacement cap for any of these two models that require a cap and wing nut for assembly of the filter to the vacuum cleaner. When assembled to the filter the well side down allows proper fit to the Craftsman brand, when the cap is reversed the dome side up will allow the filter to fit the Ridgid brand. This filter cap fits most Craftsman wet dry vacs from 1988 to current, 5 gallon and up with filter cap and nut. Fits most Ridgid vacs with cap nut. (Note ? Filter cap is required for proper installation to Ridgid Models). One-time purchase of cap is necessary for Ridgid models. THIS LISTING IS FOR THE FILTER CAP ONLY, NOT THE ACTUAL FILTER. If you wish to purchase the Filter as well, Please contact us. *This product is manufactured by KOPACH FILTERS, LLC. This is not a product of, or is it sponsored or endorsed by, Craftsman or Ridgid. The Craftsman and Ridgid names are registered trademarks. If you would like to purchase a sleeve of 12 filter caps, contact us through messages for more information, and pricing discounts!