This filter will fit most Sears Craftsman® brands that require a plate and filter nut.The Filter Dimensions are: 8 1/4" high, I D is 4 3/8" O D 6 1/2" If you currently have a plate and filter nut the only requirement is to purchase a filter. The Green cap is a requirement and a one time purchase for the Rigid® brand only. The cap can be purchased separately and will fit most models from 1988 to present vacuum cleaner that require a plate and nut for assembly. 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 Rigid® models.The Green Cap is a reversible cap that allows the filter to fit two different brands of vacuum cleaners which are Rigid® & 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 Rigid® brand.This filter fits most Craftsman® wet & dry vacs from 1988 to current, 5 gallon and up with filter cap and nut. Fits most Rigid® vacs with cap & nut. (Note - Filter cap is required for proper installation to Rigid® Models). One-time purchase of cap is necessary for Rigid models, use replacement filter No. C57944095. Also replaces Sears" "Red Line" Craftsman filter part No. 17816.THIS LISTING IS FOR THE FILTER ONLY, NOT THE FILTER CAP.*This product is manufactured by KOPACH FILTERS, LLC. This is not a product of, or is it sponsored or endorsed by, Craftsman® or Rigid®. The Craftsman® and Rigid® names are registered trademarks.906-863-8611 for more information!