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That side drain plug is just a hollow bolt with a tapered seat and it should unscrew all the way....however, i have has dozens of them not unscrew more than enough to drain the coolant rather than come all the way out.
If you insist on removing it then you need to apply some heat from a torch...and then wring it out with a short 19mm ring or deep throat socket.
If so...have a replacement handy.
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