Effective last Monday, November 2, a welded Aqua Stat well is now incorporated into all SuperStor Ultra units. The Aqua Stat well will no longer come as a replaceable accessory; it will be welded into the tank. New units will now have a label on the tank indicating that the Aqua Stat is not removable. Additionally, the Aquat Stats will no longer have a hex at the port, which were used for removing and replacing the accessory.
The Aqua Stat well (part number PMW-3SENP-1) is still available for SSU units manufactured prior to the Monday, November 2nd.
Below is a picture of the new Aqua Stat well for your reference.