This is American Pneumatic Tool part number 1280583551, which replaced the older number 04357 back head Ass’y, stocked at Crowder Supply as APT4357. It caps the cylinder and houses the throttle path on a breaker. Thread damage at the inlet is the most common reason one gets replaced.
It appears on the 117 Paving Breaker breakdown. That machine is the APT 117 Pneumatic Paving Breaker if you are pricing a replacement rather than a repair. Compare it to the reference callout on the diagram to be sure it is the position you need.
Everything else on that machine is one page away, and the full diagram library indexes every breakdown we publish. Denver stock, with same-day shipment on in-stock orders in by 4 PM ET.
- Part number: 1280583551
- Previous part number: 04357
- Manufacturer: American Pneumatic Tool
- Crowder SKU: APT4357
- Listed on breakdowns for: 117 Paving Breaker
