Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 6.421-117.0 found under Manometer Inclined Tube by Karcher Alfred Inc. The National Stock Number assigned to this part is 6685014436699, 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 6.421-117.0.