Water Pump Impeller Replacement for Mercury Mariner Outboard This is the critical component of the water pump and ensures a continuous supply of the correct amount of coolant to the engine. Carrying a spare impeller on your craft is advisable. Using the Water Pump Impeller guarantees safety and peace of mind. Replace: for Mercury Mariner 47-84797M for 18-3067 for CEF 500326 Application: (1) Fit for Mercury Mariner outboard engines 2-stroke: 20HP 20C Mode Code 6A9 30HP 30A W30(W-MARATHON) 25HP 25C (through propeller exhaust) 28HP Mode Code 664 (2) Fit for outboard engines 2-stroke: 25hp & 30hp 2-Stroke 1984-87 CV25 (25hp) & CV30 (30hp) 2-Stroke 1989-90 C25 (25hp & C30 (30hp) 2-Stroke 1991-97 Material: ABS colour: black Package Contents: 1 x Water Pump Impeller Only the above package content, other are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.