Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number REF.NO.42545 65-A3 found under Analyzing Kit Chemical Agent by Thermo Fisher Scientific Inc. The National Stock Number assigned to this part is 6665015591535, 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 REF.NO.42545 65-A3.