Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number HP12 1000-4AG found under Filter High Pass by Filtek. The National Stock Number assigned to this part is 5915013540920, and the Federal Supply Class is 5915 Filters And Networks. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like HP12 1000-4AG.