I think this is the interior plastic cover for the Emergency Gear Pump Handle. I bought one several years ago and it was way more than this. If you need one this might be a good deal.
$45.00
http://www.barnstormers.com/cat.php?mode=search
On Cessnaparts.com
3 results returned.
Part No. Description Your Price (Units)
Order 1280121-1-279 PAN EMB
(List Price: $ 267.00) Stock Available $ 213.60 (EA)
Order 1280121-1-532 PAN HAND PUMP
(List Price: $ 298.00) Stock Available $ 238.40 (EA)
Order 1280121-1-B40 PAN EMB
(List Price: $ 282.00) Stock Available $ 225.60 (EA)