TD42 coolant drain

Hi there, I have searched the forum for this but don't really get a clear answer with picture and as I'm no mechanic I want to be sure before I do it!

I want to do a coolant drain on my 4.2 and understand I need to drain the coolant from the block as well as the rad etc.. Is this the coolant drain behind the exhaust near the back of the block?

Cheers for any help!
Tony

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Certainly is mate. It will be easier to get from underneath.