I found it needed to be hammered in but it was an 8mm square. This was on a 2002 1.1 petrol. Halfords also sell a tapered black one i think, i've used that but the taper means it's hard to but big torque on it.
Or maybe buy an 8mm and shave a little bit off with a grinding wheel? Not ideal but it would work, i had trouble finding smaller than 8mm squares too, google kept suggesting alans.
Life would be easier with universal jointed arms and fingers sometimes
A handy tip for sump drain square plug. If you've not got the proper square socket you can undo a door handle from your house and use the square metal bar that connects the door handles. I found that a perfect fit.
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