This is Chicago Pneumatic part number P089320, which also shows up as 3310103729 packing piston, stocked at Crowder Supply as CP-P089320. The piston is the striking mass of the tamper; its condition sets impact energy, so scoring, mushrooming, or lost diameter shows up directly as reduced production.
It appears on the CP 0004 Backfill Tamper breakdown. It comes off the CP 0004 Pneumatic Backfill Tamper. Check it against the reference number on the diagram first; serial breaks change what fits.
Need the parts around it? They are on the same breakdown, and the parts breakdown index covers every machine we publish. Denver stock, with same-day shipment on in-stock orders in by 4 PM ET.
- Part number: P089320
- Also listed as: 3310103729
- Manufacturer: Chicago Pneumatic
- Crowder SKU: CP-P089320
- Listed on breakdowns for: CP 0004 Backfill Tamper
