What is this?
 

Is it worth selling?

not real sure WHAT it is, but if it helps any mine was bolted on where the right fender and core support meet

I think it's going to make nice 3 point shot into the trash can along with a bunch of other stuff I can't seem to get a picture posted of though!!!

thats the carbon canister, part of the evaporative emissions (tank vapor vent).

All mine get tossed. Not worth much.

You will never need it unless your state ever goes to smog inspections.

We get alot of calls for those canisters from people restoring their trucks back to original.