Dyson Genuine DC40 Pre-filter Assy #DY- 923587-02 This part is compatible with models including; DC40 This is a manufacturer substitution. Part may differ in appearance but is a functional equivalent to prior parts including; 923587-02 Genuine Original Equipment Manufacturer (OEM) part. Compatible Brands: Dyson This pre-filter (part number DY-92358702) is for vacuums Follow the instructions in the owner's manual when installing this part