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Pencil zinc anode 5/8" x 2" with 1/2" NPT plug. Pencil zinc anodes protect coolers (heat exchangers) from galvanic corrosion. Anodes are offered as a complete assembly (this product: anode & plug) or as a replacement anode only (SKU E-2Z). Designed for use with the Nuvair C10, C15 and C16 coolers.