How do I open this coolant drain?

[AndyL]

My coolant drain looks this one. Do I open/close it with a flathead screwdriver?

Thanks,
Andy

 

[Don S/V ILLusion]

The hexagonal shape is a clue. Wrench

 

[AndyL]

Isn't that for removing the drain from the block? I just want to open the drain.

 

[Ralph Johnstone]

 

[AndyL]

I found the issue. The first picture shows a drain that is broken but can still be used with a screwdriver. I thought it was the same as mine but mine still has a small knurled knob at the end (see below). Since that was too stiff, I did use a screwdriver to crack it loose and then you can turn it via the knurled knob. I was nervous about it since I was used to seeing the type you show above but all is good for now!