O-RING – 40 x 3.5mm carries Atlas Copco part number 3310093300 and is stocked here under AC-3310093300. Its job is to hold the pressure boundary between two mating faces; a hardened or nicked seal shows up as lost power and a damp housing well before anything else fails.

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 catalog. Ships from our Denver warehouse; in-stock parts ordered by 4 PM ET go out the same day.

• Part number: 3310093300
• Manufacturer: Atlas Copco
• Crowder SKU: AC-3310093300