Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number K840721 found under Strainer Oil Compressor by Hdt Expeditionary Systems Inc. The National Stock Number assigned to this part is 1650003375300, and the Federal Supply Class is 1650 Aircraft Hydraulic Vacuum And De-Icing System Components. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like K840721.