Yamaha - Outer plate,cart. - 682-44323-40-00Yamaha Outer Plate, cartridge Cooling System Component 682 44323 40 00 Overview This is one of those small parts in the water pump setup that can cause bigger issues if its not in good shape. The outer plate helps guide and seal water flow through the cartridge, keeping everything moving the way it should. Ive seen worn plates lead to weak water pressure and inconsistent cooling. When its solid and properly seated, the whole system works smoother and