If a stern thruster is installed on a boat transom with hull extensions or 
appendages, swim platform brackets, surface piercing drives and other 
obstructions to the inflow and outflow of the thruster water jet, a substantial 
reduction in effective thrust will occur.
To significantly improve these situations, thruster diverter cowlings may be 
bolted to the ends of the stern thruster tube, to direct the water jet away from 
the obstructions. 
The cowlings are not designed to improve stern thruster performance in 
shallow draft situation where the stern thruster tube has been installed at less 
than the depth specified in VETUS installation manuals and other document