Ordering by number: this is 3121087400, the Atlas Copco valve. It directs the flow that reverses the piston in the tool. Valve wear changes port timing, and the machine loses blow rate before it loses the ability to run.
Give us the model and serial off your machine and we will confirm the fit; the parts diagram hub and the Atlas Copco catalog are the other two places to start. It ships out of Denver, same day on in-stock orders placed before 4 PM ET.
- Part number: 3121087400
- Manufacturer: Atlas Copco
- Crowder SKU: AC-3121087400