It is unique. MG31-9A.new style reverse valve with retaining knob and screw. as the anvil nose bushing. as the 3/8" drive anvil socket retaining ring. They have surface rust "flashing" or staining on both sides.

Brand: Snap on
Non-Domestic Product: No
Type: Air Tool Parts
Warranty: No
Unit Type: Unit
Custom Bundle: Yes
Manufacturer Part Number: MG31,ME11C10,MG31-501,IM3100-14,MG31-9A
Bundle Listing: Yes
Country/Region of Manufacture: United States
Modified Item: No