Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number F180523 REV B ITEM 43 found under Valve Linear Direct by Oldenburg Group Incorporated. The National Stock Number assigned to this part is 4820016422931, 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 F180523 REV B ITEM 43.