Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 4.0-1750FB ITEM NO. 2 found under Float Valve by Robert H Wager Companyinc. The National Stock Number assigned to this part is 4820015526366, 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 4.0-1750FB ITEM NO. 2.