How can I tell If i have 4an or 6an fittings

Need to get some accesories for my kit and when I went looking for them the list 4an and 6an. Does anybody know what size the nitrous works kit comes with?

Well I haven't seen that kit, but I doubt it uses 6AN lines. That's a 3/8" line, and 4AN is a 1/4" line.

Dave