Ordering by number: this is 9245998737, the Atlas Copco cylinder sleeve. It carries the piston and the port timing for the tool. Bore wear is gradual, so it is usually diagnosed by falling performance rather than a breakdown.

If you are working from a machine rather than a part number, start at the parts breakdown index, or send us the model and serial and we will match it. Machines themselves are on the Atlas Copco catalog. Denver stock, with same-day shipment on in-stock orders in by 4 PM ET.

• Part number: 9245998737
• Manufacturer: Atlas Copco
• Crowder SKU: AC-9245998737