Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number B15813 PART B15819-1 found under Disk Valve by Speco Corp. The National Stock Number assigned to this part is 4820013357476, 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 B15813 PART B15819-1.