Sierra impellers are manufactured to match the original part they are designed to replace, and will meet or exceed OEM specs. This part is for use with Alpha I-Generation 2 s/n D494569 & above Mercruiser Vazer; 30/40/45/50/60 4-stroke Bigfoot, 60 (3cyl) Bigfoot, 75-125 (all 3 & 4 cyl models) A996142 & Up; 75/90/115 4-Stroke, 150 EFI 4-Stroke, V-200 (3.0L) DFI, and V-225/250 (3.0L). Includes key.