Quicksilver 89984T4 ImpellerQuicksilver 89984T4 Impeller OptiMax 2.5L non-pro models with serial number 1B227000 and above. Designed for MCM and outboard applications, it features a brass insert.Features Provides cooling water to your outboard engine; Impeller elastomers provide improved flexibility across broad temperature ranges; Center insert resists tearing to ensure performance; Designed for durability and consistent cooling flow; Meets Mercury Marine original equipment manufacturer specifications; *Special Order Item