Camp Zinc - Zinc Pen & Plug 3/8" Caterpilla - 6L2280. Ensure superior corrosion protection for your Caterpillar engine with the Camp Zinc - Zinc Pen & Plug 3/8" Caterpilla - 6L2280. This precision-engineered sacrificial anode defends internal engine components from galvanic corrosion, extending equipment life and maintaining performance in harsh marine environments. Designed to fit seamlessly into 3/8" threaded ports, it provides reliable, easy-to-install protection.. Key Features. High-Purity Z