PWR5216: 4" x 6" (290mm) Liquid to Air Barrel Cooler 270HP PWR5217: 4" x 8" (349mm) Liquid to Air Barrel Cooler 290HP PWR5218: 4" x 10" (395mm) Liquid to Air Barrel Cooler 300HP PWR5219: 6" x 8" (435mm) Liquid to Air Barrel Cooler 600HP PWR5220: 6" x