Dyson DC-25 Long Life Washable & Reusable Pre-Filter by Crucial Vacuum. High Quality Replacement for Dyson DC25 Pre-Filter Part# 914790-01. This filter is located directly underneath of the dust bin when it has been removed from the vacuum. Absolutely Essential for Allergy Sufferers! 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 manufacturers 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.