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.
Cooper Heater Strap. This is the shorter style of the 3 we have in stock (SKU #: 300016, SKU #: 300390). Copper construction provides easily installation for connecting your spa heater to the PC Board.