Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 838Y1-5IN found under Valve Check by Rockwell International Corp. The National Stock Number assigned to this part is 4820001272255, 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 838Y1-5IN.