SEI MARINE PRODUCTS- Mercury Mariner Force Prop Shaft Seal 26-70081 50-150HP 2 Stroke 4 Stroke 1978+ This prop shaft seal replaces OE#: 26-70081 and fits Mercury, Mariner, and Force outboard lower units with the following applications: 2 stroke inline 3 & 4 cylinder, metric 50-125hp 1987-current, 4 Stroke 50-150hp, and 80-150hp inline 4 & 6 cyl. 2 stroke 1978-1988.