ATF flush question

[first-things-first]

Hi

I have a late 2005 Mk2 ZT diesel auto.

Have looked at threads concerning ATF flush (such as Beinet's excellent how to). I have the later water oil cooler and understand you need to remove pipe marked W to flush out the torque converter - see here http://www.the75andztclub.co.uk/forum/showpost.php?p=1522804&postcount=23.

My questions - will ATF flow out of the rubber pipe or the oil cooler stud when the connection is released and the flush is started? What size of hose do you need?

Thanks

Andrew