Anode Rod, Magnesium Sacrificial anode rod for the Ariston GL2.5 and Ariston GL4 mini-tank water heaters Also for the Ariston GL2.5Ti, and Ariston GL4Ti mini-tank water heaters Can also be used for the older Ariston models P10S and P15S Can be used for the new "S" Series Ariston heaters (i.e., the GL2.5S and GL4S)