The new stainless steel plate that covers the barrel area. The hot plate goes under the valve motor mount plate by using the same bolts. Put the mold fan assembly to the side first. Simply unscrew two bolts on the valve motor mount. Raise the motor mount plate and slide the hot plate under then put the bolts back in place. Make sure the chain is tight when you pull the motor towards you. This is a spare part and no need to buy along with the machine.