Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number L500073HS found under Module Flow Control by Hydro Stack Mfg Corp. The National Stock Number assigned to this part is 4820012213652, 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 L500073HS.