Saniflo Capacitors come in various sizes and capacities.
The Canicubic version sold before 2014 had R3 style motors and needs this capacitor where it has failed.
The capacitor assists the startup of the motor before the mains power kicks in.
The units this is suitable for are the SaniCubic ranges as mentioned above with R3 motors :-
Also works in some other brands of macerator. Please check before ordering if for another make or model.