Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number SPK-4 found under Parts Kit Electro Mechanical Rot by Grinnell Supply Sales Co. The National Stock Number assigned to this part is 4810014394099, and the Federal Supply Class is 4810 Valves Powered. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like SPK-4.