Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number K-2000-1-720 ITEM 6495-407 found under O Ring by King Engineering Corporation. The National Stock Number assigned to this part is 5331013393098, 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 K-2000-1-720 ITEM 6495-407.