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Namura Piston Rings for Polaris 570 Models - 99.94mm - NA-50019-4R feed-mpn-ESR322 2015 Arctic-Cat SUPER DUTY DIESELNamura Technologies Piston Rings Part Number: NA 50019 4R Piston Rings are an essential part of piston performance, engine efficiency, and durability. Namura piston rings are designed specifically for each application with the best materials and precise fitment. Composed of either a highly ductile cast iron or stainless steel alloy. Quality provide excellent wear resistance and a gas tight seal. Often overlooked and unglamorous, they are an essential