The part number D390-4600B refers to a Telescopic Electric Wand Assembly used for several Riccar and Simplicity canister vacuum models. This component connects the electric hose (which you mentioned in your previous query) to the electric power nozzle (the vacuum head with a spinning brush roll). Key details about the part: Part Type: Telescopic Electric Wand Assembly (or Wire Integrated Wand Assembly). Function: It is a metal wand that can extend (typically from about 27" to 40") and has integrated wiring inside to transmit power from the hose to the electric power head/nozzle. Common Compatibility: It is compatible with many Riccar and Simplicity canister vacuums that use an electric power nozzle, including models like: Simplicity: Verve, Cinch, Snap, Gusto, Moxie, S24, S36, S38. Riccar: Pristine, Charisma, Pizzazz, Immaculate, Impeccable, 1500P, 1700, 1800.