I recently (OK, a month ago) ordered a drain plug tool which I am still waiting for. In the mean time, I have found an alternative that works like a charm for under $10 and is as close as your nearest Home Depot!
In the plumbing section there is a tool made by Brass Craft (Model T143) that is called an "internal Pipe Wrench" for removing 1/2 inch pipe nipples. The main shaft of the tool fits perfectly in the ZF plug and can be used with a regular open-ended wrench, or cut off and used with a socket.
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