HP Kit—White Backing A4 (5851-7206) is a replacement white backing for the document feeder on the HP Digital Sender Flow 8500 fn2. It is intended for replacing the feeder’s backing as part of service or repair.
The backing attaches to the document feeder lid and aligns with the flatbed scanner glass. This positioning restores the backing at the scanning area when the existing part needs replacement.
HP’s service manual describes it as a replacement assembly and states that no special tools are needed for removal or installation.