Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number HI 3874-0 found under Nitrate Reduction Test Reagent by Hanna Corp. The National Stock Number assigned to this part is 6550016797507, 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 HI 3874-0.