901M01-SD Mixed Flow Jet-Super Duty. Best mixed flow pump for the buck. Considered the "extreme" super-duty contender, the 901M01-SD combines the best the industry has to offer in an economical package. We listened to those in the toughest global environments to update this traditional favorite. Salty, sandy conditions? No problem because no shortcuts were taken here. Ideal for the jet boat world where low cost and maximum speed with a light boat is the goal.