Cardone 55-31120 New Water Pump Unitized seals produced with superior materials drastically enhance operating life. Hubs and impellers are precisely perpendicular to the bearing shaft to eliminate vibration. Manufactured to original casting specifications; bearing type (ball/roller vs. ball/ball) and materials meet or exceed original specifications. Applications are not over consolidated, and are precision machined ensuring proper fit. 100% tested for maximum performance and durability.