Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number FS273-5 found under Ball Float Sensor by Fisher Controls Co Inc. The National Stock Number assigned to this part is 4820011786577, 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 FS273-5.