Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 19-07724-51-550 found under Protector Thermal O by Elkay Mfg Co. The National Stock Number assigned to this part is 6110013126259, and the Federal Supply Class is 6110 Electrical Control Equipment. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 19-07724-51-550.