GSW, John Woods, A.O.Smith Genuine Water Heater Magnesium Anode - $30
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New, still in unopened box. Selling as we changed hot water systems. This was a spare one. GSW recommends that the sacrificial anode in hot water tanks (which protects that tank from rusting out) be checked every year and replaced if more than 50% depleted. Consult your manual for details
GSW, A.0 Smith, John Wood part number 100097440 (Hex head, 39 inches long total)