Schedule 40 Steel Pipe Nipple, 1-11-1/2 Male NPT, 2.50 Inch Long

For a 1-inch line, the thread spec here is 1-11-1/2 NPT, which is the standard male thread pitch for 1-inch nominal pipe. At 2.50 inches long, it gives you just enough reach to bridge a short gap without adding unnecessary length to your run. Schedule 40 wall thickness is what you'd expect for general industrial service, so it holds up fine in typical pipe system work.