Anode rod extends tank life by providing water heater from corrosion, 3/4 In. MNPT X 32 In. length fits many tanks, can be cut to fit shorter tanks, sturdy magnesium construction magnesium anode rod commonly used in water heaters affected by soft-water, at least once per year flush heater tank, inspect anode rod and replace when necessary to help extend tank protection. Replacement part for: A.O. Smith, A.O. Smith Canada, American, GSW, John Wood, Kenmore, Lochinvar, Maytag, Mor-Flo, Penfield, Reliance, Sears, State Industries, U.S. Craftmaster, Whirlpool. Fits: Bradford White, General Electric, Rheem, Richmond, Ruud