Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 439B750PC3 found under Seat Valve by General Electric Co. The National Stock Number assigned to this part is 4820007942777, and the Federal Supply Class is 4820 Valves Nonpowered. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 439B750PC3.