AES Industries 4101 Self Closing Brass 1/4" NPT Air Chuck for Safely Inflating Tires with a Schrader Style Valve Stem WORKS with all Schrader style tire valve stems. SELF CLOSING INTERNAL VALVE SYSTEM keeps this chuck sealed air tight when not being used and is safe to keep as a permanent attachment on a dedicated air line. BRASS CONSTRUCTION RESISTS corrosion and rust that can happen from normal air line moisture or from leaving it outside. Hose Fitting Size: 1/4" NPT Maximum Working Pressure: 90 PSI