This is a brand new part, VOLVO aluminum fuel tank filler cap w/8" retaining chain. Durable heavyweight Aluminum, non-locking cap.

Part no. 20770657 replaces 20511587, 20745985 and 20770683

Go ahead and do some price checking before buying, I have found this cap selling for $50 - $70. You won't find it any cheaper than $19.95, I can assure you that. 

Fast shipping anywhere in the US just $4.95