Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 2503378-005 found under Valve Gate by Envirovac Inc. The National Stock Number assigned to this part is 4820013258250, 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 2503378-005.