Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 3S-5441-1 PART 4 found under Disk Valve by Ruggles Klingemann Mfg Co. The National Stock Number assigned to this part is 4810012597692, 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 3S-5441-1 PART 4.