Corro-Protec CP-R Titanium Powered Anode Rod for Water Heater (40-80 gal tank) Eliminates rotten egg smell in water caused by hydrogen sulfide Replaces water heater (40-80 gal) tank's existing hex head anode rod only Water softener use does not affect the longevity or protection Water Connection made simple with easy to read instructions Extends life of water heater tank - 20-year Manufacturer's Warranty