B230FT Block Coolant Drain Oil Cooler Pipe Removal

[PCH]

What is the correct tool to use to unscrew the pipe nut from the block drain on the late 940 Turbo motor? Is it a Crowfoot 21mm, may be a 21 Pipe Crowfoot? The fitting is very obstructed by the coolant pipe and the bell housing flange and I was not able to get a good grip on it with adjustable wrench even after removing the down pipe and the oil filter.
Trying to unscrew Pipe #12 from Fitting #13:

 

[hessam69]

You might need to get creative in using a tool that fits.

May even have to bend a spanner to get enough room to turn it

 

[conehead]

Pretty sure I used an adjustable wrench and channel locks...

 

[PCH]

7/8 (22mm) open end wrench worked. Crowfoot would probably be ideal for this task because the wrench was only fitting at an angle and marred the pipe nut a little.