vortech drain line

02edge

Active Member
I finally got some time today to work on the car a bit extended all the wires I needed to and started working on the drain I punched out the hole and started making the hole bigger but it says to make it 9/16 and than tap with a 3/8 tap. I didnt finish making the hole but looking at my tap and the size of the fitting it looks way off am I missing something here?
 
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