Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number EFM620S found under Valve Calibrated Fl by Deltrol Corp. The National Stock Number assigned to this part is 4820014114913, 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 EFM620S.