can just pull this thing out? or does it screw off? and plug it with a coke bottle?

edit i forgot to add tha this is on a comptech s/c with aftercooler setup.

 

Are you talking about this elbow? If so, just remove the clamps and work it out. Two small hoses (one you can see, the other is underneath and is much smaller) need to be removed as well.

What are you plugging, and why do you want to plug it with a coke bottle?