Your search for "5kfvw" revealed the following:
Dell 5KFVW N4000 Series 2x 40GB QSFP+ Switch Module
SKU: NSH-8069
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
NEW Dell 5KFVW N4000 Series 2x 40GB QSFP+ Switch Module
SKU: NSN-5068
Condition: New
Shipping: Overnight Options
Warranty: 365 days