Abstract: A small tubular water discharge diverter has an externally threaded portion at one end for connection to the cooling water discharge port of an outboard engine and is bent along its length to conform generally to the profile of the underside and side wall of the engine exterior. The outer portion of the water discharge diverter is bent upwardly and slightly outward relative to the engine side wall. The engine water pump draws water into the circulation system of the engine from the body of water in which engine is operating where it is circulated through the engine to cool the engine. A portion of the cooling water is discharged through the water discharge diverter and ejected upwardly and outwardly toward the rear in a "rooster tail" which is visible over the top of the engine whereby the discharge water can be easily and conveniently observed by the pilot of the boat from the bow or steering station.