A Metal Flow Control 8mm x 1/8" M is a valve used to regulate the flow of liquids or gases in a system. The 8mm indicates the size of the inlet or outlet, and the 1/8" M refers to a 1/8-inch male thread connection. This type of flow control valve is typically used in pneumatic, hydraulic, or fluid systems to adjust the flow rate and ensure precise control. The metal construction offers durability and resistance to wear, making it suitable for use in industrial, automation, and various fluid management applications.