The Specification including Metric and Inch. BSPP, BSPT, NPT thread are available This series of fittings is made of plastic and brass, which is widely used in pneumatic system. Technique information: Medium: Air and Water Working Pressure: 0~150PSI Working Temperature: 0-60?C (32~140?F ) Air tube connected: Nylon and Polyurethane Features: 1)Convenient One touch fittings provide instant tubing connections: 2)Elliptical release ring help to connect the tube easily by manual, no special tools required. 3)(Nickel-plated )brass threaded bodies ensures anti-corrosion and anti-contamination. 4)All threads are pre-coated with Teflon sealant and require no additional sealing.