Nitrous Purge 4AN or 6AN?

[hamonkeiser]

I'm ordering a purge system for my Edelbrock Performer RPM Nitrous Kit. Do I need the 4 AN fitting or the 6 AN?

 

[hamonkeiser]

Anyone know?? I called Summit & they don't know what size line the Edlebrock system uses, The Kit is Edelbrock part number 70400.