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A small pipe wrench should work. Of a good set of water pump players. You should not need to remove the pump. I always used a metal plug. The only time I noticed plastic on the water pump, was when it leaked. Might hold for a long time. But a metal plug never leaked. What ever makes you happy...

Seen it both ways. The only problem with plastic was some times it can leak. A metal hex head plug and a dab of sealer is what I used every time I had one, (come to think of it, always plastic) leak.