This is a direct replacement for the Ibanez TS808 Tube Screamer Overdrive Pro micro switch.
This switch is found inside the square silver bypass footswitch assembly.

If you are having issues with the pedal turning on/off sporadically or not at all, this is the switch that probably needs replacing.

1. Open the pedal and remove the wires from the back of the pedal assembly.
2. Remove the snap ring holding in the small round PCB. A small screwdriver to pry out the ends of the snap ring works well.
3. Remove the old switch from the PCB and replace it with the new switch.
4. Reassemble.