Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number EL100 found under Lifter Valve Spring by Sunnen Products Company. The National Stock Number assigned to this part is 5120002390326, and the Federal Supply Class is 5120 Hand Tools Nonedged Nonpowered. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like EL100.