Your search for "ap4423" revealed the following:
For APC AP7721 AP7722 AP7750 AP7750A AP4423 ATS Ears Rack Mount Bracket Kit
SKU: NSB-6313
Condition: New
Shipping: Overnight Options
Warranty: 365 days
$ 24.99
• 247 in stock
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APC AP4423 ATS 8x IEC 60320 C13, 1x IEC 60320 C19 1U 230V ATS
SKU: NSB-8256
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
NEW APC AP4423 ATS 8x IEC 60320 C13, 1x IEC 60320 C19 1U 230V ATS
SKU: NSN-1126
Condition: New
Shipping: Overnight Options
Warranty: 365 days