Cylinder, Atlas Copco part number 3121590300, listed at Crowder Supply as AC-3121590300. The cylinder is the bore the piston runs in, and it sets the working clearance of the tool once the bore opens up, air bypasses the piston and blow energy drops.

The full diagram library is where to start if you are working back from a machine or send the model and serial and we will confirm it. Complete tools sit on the Atlas Copco tool range. Stocked in Denver orders placed by 4 PM ET ship the same day when the part is on the shelf.

• Part number: 3121590300
• Manufacturer: Atlas Copco
• Crowder SKU: AC-3121590300