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Dyson DC40 pre filter. Compare to part # 923587-02. Fits Dyson DC40 Multi-floor Upright Vacuum. Absolutely Essential for Allergy Sufferers! Designed and Engineered by Crucial Vacuum. This is a generic product designed and engineered in the United States by Crucial Vacuum. This is not a Dyson® OEM product and is not covered under any Dyson® manufacturer's warranty. Please check your manufacturer's warranty with regard to the use of non-OEM parts. Crucial Vacuum provides no warranty or guarantee with regard to the product or its compatibility with your Dyson® product. Any use of Crucial Vacuum non-OEM products in your Dyson® product is done at your own risk. The Dyson® brand names and logos are the registered trademarks of their respective owners. Any use of the Dyson® brand name or model designation for this product is made solely for purposes of demonstrating compatibility.