The AF40-F04D-A is a part manufactured by SMC Corporation. It is a directional control pilot operated air pilot solenoid valve. It is composed of a body, a coil, a thermal protector, and a plastic cover. This valve has a port size of 4mm, and operates on voltage of 24 VDC, with a power consumption of 6W. It uses a push-in fitting type connection method, has a rated flow rate of 33 L/min, and a maximum pressure of 1.0MPa. This valve is used to control the flow of air or other media through a system and is suitable for applications including food and beverage, medical, and general automation industries.