The Kopach Cap is designed to fit both Craftsman and Ridgid vacuums, for Craftsman this cap is a replacement and will work with filters designed to fit onto Craftsman shop vacs. For Ridgid, this cap is required one-time purchase to make Kopach Filters fit onto Ridgid shop vacs. If you have any problems with this cap fitting in your vacuum please feel free to contact us and we can help you get what you need!
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