Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number S5500 found under Nozzle Assembly Monitor Type Fir by Tyco Fire Products Lp. The National Stock Number assigned to this part is 4210003943209, and the Federal Supply Class is 4210 Firefighting Equipment. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like S5500.