Kohler Engine Zinc 260085 Zinc w/ Plug (E-0) 1/4" NPT x 1-3/4" Length
These are pre cut zinc engine anodes complete with brass plug and zinc.marine engine zinc Anode for all Caterpillar diesel engines. Zincs should be replaced every season or after 2/3 of zinc has eroded, which ever happens first. 		E-0 ENGINE ZINC ANODE 1/4"NPT x 1-3/4"Engine pencil zincs-complete with end plug    zinc pencil length: 1-3/4"   diameter: 3/8"    Wrench size:  9/16    plug n.p.t = 1/4"Picture is of a larger size-for reference