Have you cleaned your Nautilus or Nautilus Mini and broken the rubber insulated ring, or is the pin simply not connecting to your battery?
Replace them instead of throwing away perfectly nice tanks!
This kit contains everything you need to replace the insulated connector and bottom spring&pin combo on the bottom of your tank base. The rubber insulated connector might become dry and brittle over time and no longer stay in place.
The spring and pin form a connection between your tank and your battery. The spring can wear out, causing the pin to sit flush with the bottom of the tank, preventing the pin from touching the battery connection.