Make sure to use a small swing check valve so any trash in the bilge can pass thru and not clog it. I had this problem once and had to disconnect the hose to remove the trash from the inlet side of the check valve.
Rather than put a check valve in the bilge pump line, I would length the hose is possible and route it higher than the outlet in the hull. This should limit the water coming in and not a risky as a check valve in the bilge pump hose failing.
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