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It's a borehole pump. The top half is the motor, and they are usually filled with oil to keep out water, using the principle of the diving bell.Dunno the term
It fits down something like an 8" diameter well pipe
It's cylindrical shape stainless steel finish
They soon overheat if the motor isn't in water.
Sure the hole is a big as 8". The one's I've fitted go down a 4" pipe.