FESTO MFH-3-1/4 Solenoid Valve (Part No. 9964) The FESTO MFH-3-1/4 is a 3/2-way, normally closed (NC), monostable pneumatic solenoid valve designed for reliable control of compressed air in industrial automation systems. It features a pilot-operated poppet seat design, G1/4 threaded ports, and a mechanical spring return, providing dependable switching performance and long service life. The solenoid coil is ordered separately.