Ordering by number: this is 3303005378, the Chicago Pneumatic back head – complete. This is the upper housing of the tool, taking the through-bolt load and the inlet connection.

The parts diagram hub is where to start if you are working back from a machine or send the model and serial and we will confirm it. Complete tools sit on the CP tool catalog. Denver stock, with same-day shipment on in-stock orders in by 4 PM ET.

• Part number: 3303005378
• Manufacturer: Chicago Pneumatic
• Crowder SKU: CP-3303005378