Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number YU2158 found under Valve Assembly by Hydro Engineering Inc. The National Stock Number assigned to this part is 4820015141599, 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 YU2158.