For Engine Anode
NPT Size of Brass Plug: 3/8 NPT
Diameter of Zinc Rod: 1/2″
Length of Zinc Rod: 2″
EMP Zinc anodes conform to Mil-Spec: MIL-A-18001K

also crosses with:
Canada Metals CME1
Performance Metals CE-1
GLM 12927
Technoseal TEC-E1H
Camp E-1C
Reliance MDE-1