If the web site don't help. It is used on larger jet boats to trim the nozzle up or down changing the attitude of the boat for quicker planing and more top end speed. Just like the trim on an outboard or sterndrive.
Mercury consolidates, introduces the Boat- Motor-Trailer package, and the Optimax. Visit www.screamandfly.com - the internet's largest ...
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Mercruiser Parts 1986 Four Winns bowrider with a Mercruiser 3.0L Marine Engine, is this the proper balancer for the... 
Metamucil: For when the lower part of your body doesn't quite sound enough like a rusty old motor boat engine that won't turn over.