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Vacuum systems (i.e. systems for pressures ranging from 2.5 bar to 10-9 mbar (1.9 x 10-3 Torr to 0.75 x 10-9 Torr)) are quickly and easily assembled owing to the modular construction principle which is based on interchangeable standard components by means of vacuum-tight, demountable flange connections. Individual components may be exchanged easily at any time. This NW/KD-25 vacuum nipple is 3” in length and terminates in a tight 90 degree radius. It is ideal for making 90 degree turns in tight places where a traditional 90 degree elbow won't fit. They are commonly used as low-profile vacuum elbows on rough vacuum pump exhaust manifolds for Sciex mass spectrometers. Sciex part number 1013222.