This is Atlas Copco part number 4090020100 seal ring, stocked at Crowder Supply as AC-4090020100. 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.
Crowder’s breakdowns list this part on the DOP 15N 15N US 15F Diaphragm Pump. It comes off the Atlas Copco DOP 15 Pneumatic Diaphragm Pump. Pull up the diagram and confirm the reference number for your serial before ordering.
Need the parts around it? They are on the same breakdown, and the full diagram library covers every machine we publish. It ships out of Denver, same day on in-stock orders placed before 4 PM ET.
- Part number: 4090020100
- Manufacturer: Atlas Copco
- Crowder SKU: AC-4090020100
- Listed on breakdowns for: DOP 15N 15N US 15F Diaphragm Pump

