1/4" NPT brass plug X 3 length of zinc rod. Rod diameter: 3/8" Rod thread: 3/8" 24 NF Wrench Size: 9/16" If you cut down zinc length will work with: Caterpillar Marine Engine Anode Cross Reference 6L2283 Westerbeake /Universal 011885 Crusader CRU10335 CRU10972 CRU168005