Racor Filter Water/Gas Separator

[MrHunters]

This may be a dumb question (s)

On the filter, where do you unscrew to drain the water?
I see there is a little nipple type thing on the bottom but have been unsucessful at turning that to drain anything.. The filter is kind of in an awkward spot so if you have never had one and you don't have the instruction sheet, it makes for a bit of a trying experience.

Also where do you replace the micron filter once it needs it? Or is it the whole unit? If so are there any special steps I need to take if its the whole thing?

Will the water/gas separation be so apparent that I will know right away that it needs to be drain or do I have to look very closely?

Thanks for the help.
-MH