This is a copper jumper strap normally used with the ground wires in the spa. These are mounted on the back of the pumps connecting the ground wire. Is part of the connections from the heater to the PC Board.
These 52” pivot arms allow for your Ultralift Undermount to be used with a selection of swim spas. This accessory is a great option if you own a swim spa and want to use the Undermount as your cover lifter.