Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 5159B-2MP(L)-H found under Valve Safety Relief by 2 Mb Distribution. The National Stock Number assigned to this part is 4820006143369, 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 5159B-2MP(L)-H.