For limited clearance shaft zinc anode.
Shaft Diameter (ID): 1-1/4″
Thickness: 1-1/4″
Outside Diameter (OD): 2-1/2″
EMP Zinc anodes conform to Mil-Spec: MIL-A-18001K

also crosses with:
Canada Metals CMC05
Performance Metals RC1250Z
Technoseal 00556L
Camp C-05