Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number SK-2670 ITEM 18 found under Valve Ball by Insinger Machine Company The. The National Stock Number assigned to this part is 4820015284331, and the Federal Supply Class is 4820 Valves Nonpowered. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like SK-2670 ITEM 18.