Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number M5159N2M(L)800ASME found under Valve Safety Relief by Mephisto Tool Co Inc. The National Stock Number assigned to this part is 4820014167858, 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 M5159N2M(L)800ASME.