Magnum intake drilling plate project

67Dart273 said
You are confused about something here, I don't know what. If you are talking about INTERNAL diameter, pipe and pipe fittings does vary. NPT is always the same outside, and the thread is tapered, so there can be minor differences there. But the wall thickness can vary some. Also, common pipe you'll run across is "skedule 40" you can get sked 80 which is thicker and therefore much smaller ID.

I'm not confused about anything. As I said the pipe nipple is not NPT it is MIP.

MIP stands for Male Iron Pipe, or some would say Male International Pipe. The same pipe size can also be called MPT, for Male Pipe Thread. FIP means Female Iron (or International) Pipe and can also be called FPT for Female Pipe Thread. To add confusion, there is NPT, which stands for National Pipe Thread.