It’s a core plug, I don’t think you can fit a new one with the engine in place. The gearbox doesn’t get in the way but the bulkhead will.
BTW, core plugs have got nothing to do with frost or freezing. The core plugs are simply there to fill the apertures in the cylinder block that are left during production after the removal of the sand core during the foundry casting process . Without the core the cylinder block would be solid iron without a water gallery.
Also, while you’ve got the core plugs out, you might want to get a bit of stiff wire, suitably bent and probe about to check the water gallery isn’t blocked . There should be free passage of water all the way around all 4 cylinders, top to bottom.
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