Features: G3/8 inch Joint Pipe Bore, 1.5-8kgf/cm2 Working Pressure Range, 16mm gold tone thread diameter. It is a one-way directional control element, It is applied to places where the quick movement of air cylinder is required. Normally installed between the air cylinder and change valve, making the air in the cylinder escape directly through this valve not through change valve. Used in various fields, such as vehicle assembly line, electronics, machine tool.