MDI Aerovalve - Steel 1/2"-20 Flush-Mounted Fuel Drain Valve | F391-82 ORMD This is not a boring

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MDI Aerovalve - Steel 1/2"-20 Flush-Mounted Fuel Drain Valve | F391-82 ORMD This is not a boringMDI Aerovalve Steel 1 2" 20 Flush Mounted Fuel Drain Valve F391 82 F391 82 Quick Drain Valve, 1 2 20 Thread. Specially designed for use in aircraft fuel systems. The F391 flush valve from MDI Aerovalve is used as original equipment by most aircraft manufacturers and has been FAA PMA approved for replacement parts. This flush fuel drain valve is designed to be practical, functional, and inexpensive. The head of the valve does not extend beyond the wing