Sierra Marine Water Pump Base for Mercury/Mariner Outboard Motors

The Sierra Marine water pump base (also called a water pump housing or impeller housing) is a replacement part for Mercury and Mariner outboard motors. It is part of the outboard cooling system and holds the impeller in place. Together with the impeller, it moves water through the engine to help control operating temperature.

Key Features:

• Aftermarket replacement for the water pump base on Mercury/Mariner outboard cooling systems
• Designed to house the impeller and keep the water flow steady
• Helps protect the engine from overheating
• Sierra Marine builds its parts to meet or exceed OEM form, fit and function
• Suitable for routine maintenance and for rebuilding the lower unit water pump

Sierra Marine is a well-known supplier of marine replacement parts. Its parts are designed to suit boaters, marine technicians and repair shops. Choose the specific variant on this page that matches your outboard's pump requirements. Replace the water pump base at the same time as the impeller and related gaskets and seals for the best cooling performance.