Sold individually Metal box use.
Sold individually Plastic box box use.
53933 consists of the screws and plastic standoffs used to mount a daughter board or expander board onto the metal bracket that also secures the heater tube inside several Balboa series spa packs. It does not come with the daughter or expander board.
This fuse has been discontinued by Balboa. We have an alternative fuse, but it does not have the "tails" so, some extra soldering will be required.