Wow, truely impressed here martin. Have you considered designing a top of your own. I think you've got soem great ideas for improving the design. Especially the idea of the angled/tapered inlet. All of my flow experience is in airflow but, the theories are quite similar. If the inlet was tapered from 1/2"ID to match the internal diameter of the inlet barb down to the impeller inlet with a slight radius to get the water moving into the farthest point in the pump from the outlet it should maximize efficiency and increase the velocity of the the flow.
Heck, maybe I'll make one

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