Quicksilver/Mercury OEM Impeller 47-89981 Provides cooling water to your outboard engine Produced to Meet Mercury marine original equipment Manufacturer specifications to best protect your Mercury 4-stroke outboard Impeller elastomers provide improved flexibility across Broad temperature ranges throughout the boating Season Designed for durability to provide higher flow rates and cooling flow to protect your engine The center insert is bonded to the vanes to resist tearing loose and losing water flow