That is correct George. Plate or no plate, you have to close that gap between the divider plate. Technically, if you have the plate welded to the impellar, you only need to clearance the divider plate around the center hole. If you have the open impellar design, that gap technically needs to be tighened up allong the whole surface of the impellar. That forces the water to stay in the veins and be pumped instead of just being mixed between the plate and the impellar.
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