Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 124-550 found under Tool Kit Air Tubing by Grinnell Fire Protection. The National Stock Number assigned to this part is 5180003432016, and the Federal Supply Class is 5180 Sets Kits And Outfits Of Hand Tools. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 124-550.