NW25 X .125" Female National Pipe Tap (FNPT), Aluminum (1/8" FNPT)
ISO Standard vacuum fitting in size NW25. Adapts NW25 to 1/8" Female National Pipe Tap. Compatible with NW, KF, QF and ISO standards. Manufactured generally in the USA. Some exceptions apply. This is a building block approach for creating and supporting vacuum systems to 10-6 Torr.