Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 50390 found under Sleeve And Slide Di by Hydro Aire Inc. The National Stock Number assigned to this part is 4810006277699, and the Federal Supply Class is 4810 Valves Powered. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 50390.