Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number PL491-02-010 LINE ITEM 20 found under Ammeter by Carolina Power Systems Of Sumter. The National Stock Number assigned to this part is 6625015667919, and the Federal Supply Class is . Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like PL491-02-010 LINE ITEM 20.