This air control switch will work for all Jacuzzi J-300 series hot tubs.
Which Switch Do I Need?
Since everything under the cabinet is difficult to reach and encased in foam, replacing the entire assembly is not for the faint of heart. You can, however, easily replace the internal workings by un-screwing the cap, removing the existing components (they will simply pop out) and placing the new equipment in. While this may seem like a waste of materials, it is far simpler than the alternative.