Your search for "QFX520048Y-DPSU" revealed the following:

Juniper QFX520048Y-DPSU-AO QFX5200 DC 650W F-B Airflow Switch Power Supply

SKU: NSB-5050
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days

Juniper QFX520048Y-DPSU-AI QFX5200 DC 650W B-F Airflow Switch Power Supply

SKU: NSB-5049
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days