Won't burn out in sand, sediment, or lime. Recommended for areas with hard water or high mineral content. Lifetime limited warranty against burnout. Wrinkle design. Original 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