Water pump impeller kit. 3.5B 2-stroke (forward/neutral that fits the Tohatsu and Nissan 3.5 B model, 2-stroke engine. It WILL NOT fit the 4-stroke model or the non gear shift model. This kit contains the parts necessary to replace the water pump that need to be replaced with EVERY service. You NEVER replace just the impeller…You ALWAYS use the kit.