Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number SS-43XF4-51S-2172 found under Valve Assembly by Whitey Co. The National Stock Number assigned to this part is 4810014412505, 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 SS-43XF4-51S-2172.