Saltwater anode for all Cruise models with fixed pitch propeller, as well as for Travel and Ultralight 1103 AC; For mounting on the motor shaft; For Cruise FP with fixed pitch propeller, the pylon anode is also required - included in 1942-00; Not required for Cruise 2.0 / 4.0 FP with folding propeller (instead only 1964-00 or 1942-00).