Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 4-104-27-0001 found under Bulb Leveling Gas Analysis Appar by Greenfield Compression Inc. The National Stock Number assigned to this part is 6630004042500, 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 4-104-27-0001.