Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number MOD 20 001 found under Valve Safety Relief by Kunkle Industries Inc. The National Stock Number assigned to this part is 4820015344757, 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 MOD 20 001.