Replacing a switch with something that is always on
If you're trying to cover the whole box


Blank plate
Blank cover plate
Blank wall plate
Blank electrical box cover
Blank switch cover




If you're trying to cover one slot of a multi-gang box


Blank insert
Blank switch insert
Blank toggle insert
Blank Decora insert





If you just want to lock the switch in the ON/OFF position


Switch guard
Switch lockout
Switch shield