Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 158-000 found under Parts Kit Valve by Graham Co Inc. The National Stock Number assigned to this part is 4820013503858, 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 158-000.