Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number ZSV20-3 found under Valve Assembly by Nupro Co. The National Stock Number assigned to this part is 4820014972127, 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 ZSV20-3.