Ordering by number: this is P089006, which also shows up as 3310104316, the Chicago Pneumatic butt lock nut. It secures its joint against constant vibration, which is why it is treated as a replaceable item rather than a permanent one.
You will find it on the diagram for the CP 0003 Backfill Tamper. The complete machine is the CP 0003 Pneumatic Backfill Tamper. Check it against the reference number on the diagram first; serial breaks change what fits.
The rest of the assembly is on the same breakdown, and every diagram we publish is indexed on the parts diagram hub. It ships out of Denver, same day on in-stock orders placed before 4 PM ET.
- Part number: P089006
- Also listed as: 3310104316
- Manufacturer: Chicago Pneumatic
- Crowder SKU: CP-P089006
- Listed on breakdowns for: CP 0003 Backfill Tamper

