Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number F18391 PIECE 49 found under Valve Solenoid by Cyclotherm Div. The National Stock Number assigned to this part is 4810012009350, and the Federal Supply Class is 4810 Valves Powered. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like F18391 PIECE 49.