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Check valve will leak water that you won't want to soaking you ice in or aerating you box (and contents) with.
In Response To: check valve or ? ()

I would simple put a valve on the drain hose (you might allow a small "trap" to seal it with a bit of water. Then hook a hand-pump to it and pump the contents UP (using a vacume break) and then overboard.

Do you have a shower sump or pump in your head?

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