Piece of brass in air compressor tank -- problem or no?
Is there any risk of running the compressor as is, with a loose piece of brass knocking around the tank?


I dont think a loose piece of brass will be any issue.


  If not, what can I do to retrieve it?


Depending on the style you could perhaps de-pressurize the tank and remove the compressor or compressor discharge tube, giving you access to a larger port in the tank where you might be able to dump the loose piece. This can also lead to problems with leaks on the compressor discharge though... I think you are better off leaving it be.