Caterpillar Engine Zinc 6L2016 Zinc Anode 3/4 inch NPT x 3/4 inch Length Plug (E-3A)
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.