| NPT to 1/4 Inch Air Valve Stem Freedthrough, Used to Add Positive Air Pressure to Test Vacuum Lines
These adapters are male 1/4 NPT to 1/4 inch air valve stem feedthrough. They are commonly used for temporarily adding positive air pressure to test vacuum lines. The 1/4 inch air valve stem is standard and connects to most air compressor hose fittings and lines.
Brass alloys contain Zinc. Zinc will outgas from brass under certain combinations of elevated temperature and high-vacuum. System damage may occur if these conditions are present.