Since the strainers are full when the engine is running I guess your point is that you would keep them full when flushing with a hose? That is fine to try and do it, but the pumps on those engines may pull more water that the hose can supply. If they suck the hose flat you will probably toast the impeller. If you supply water through the open top of the strainer, you won't risk running the hose flat.
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