Mercury Mariner Outboard Lower Unit. Standard Rotation. -FRESH WATER- very clean, no corrosion.
Slightly chipped skeg, but straight as you can see in the pictures and does NOT affect the performance. 
Shifts smoothly, no leaks, no cracks
Fits 150hp, 175hp, 200hp

I will answer all questions to the best of my knowledge, but please ask any questions and view all pictures before purchasing. This Lower unit is sold as-is, no returns.