Unidentified Brass Marine Fitting - Possible Pencil Zinc Anode in Brass Plug - Used

Application: Unconfirmed small brass marine fitting — most likely a spent pencil zinc anode in its brass plug/holder from a marine diesel heat exchanger, cooler, or manifold; possible alternates include a vintage oil pressure sender or brass grease cup. Condition: Used, dirty, with oxidation and heavy wear to the internal element. Buyer must confirm fitment by part number, photos, dimensions, engine model, serial number, and application before purchase. Used marine part sold as-is unless otherwise stated. No returns on electrical, used, special-order, or installed parts.