Do you have smelly waterthe corro-protec powered anode made of titanium is a long-term solution to preventing sulfide smells that rotten egg smell produced by well water. Aggressive well water and the use of softeners contribute to the sacrificing of passive anodes magnesium, aluminum, and aluminum/zinc much quicker, generally requiring replacement every 2-5 years. Installation notes: may require a longer nipple and brass coupler to clear the insulation and complete the install. Adaptable to replacing hex head anodes only. Designed with a 3in long nipple. Universal to most gas and electric water heaters 40-80 gallons.