STANDARD AIR LINE COUPLER Material: Chrome Plated Steel Body For Anti-Corrosion. Working Pressure: 15kgf/cm² Maximum Pressure: 20kgf/cm² Thread Size: 3/8 Applications • Pneumatic Tools • Air Piping • Air Pressure Equipment Features • One-way automatic shut-off valve in socket. • Hardened important parts are extremely wear resistant and durable.