The 2155QiMAX kit uses a 1" anvil socket retaining ring kit which needs to be requested as stated below in my advisory. SERVICE NOTE ADVISORY: The 1" socket retaining ring kit is for the 2155QiMAX ONLY.

Brand: Ingersoll Rand
Non-Domestic Product: No
Type: Air Tool Repair Parts
Warranty: No
Custom Bundle: Yes
Manufacturer Part Number: 2145-TK2, 2145QTiMAX, 2155TiMAX
Bundle Listing: Yes
Country/Region of Manufacture: United States
Modified Item: No