NW25 X .250" Female National Pipe Tap (FNPT), 304 Stainless Steel (1/4" FNPT)
ISO Standard vacuum fitting in size NW25. Adapts NW25 to 1/4" 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.