I ordered a shower kit online that included a wall mounted tub spout. When I went to install the tub spout I discovered that it had a very large male thread, some kind of nut, and an adapter (looked like some NTP, tapered thing). The spout is supposed to be mounted through the wall, and the adapted is tightened into the pipe behind the wall. I've never seen a spout like this before. It's definitely not something can work with due to wall access issues.
What is the technical term for this type of spout/spout installation? (assuming it installs the way I think it does)