Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number FR3B1 found under Valve Asy O Ygen by Honeywell Intl Inc. The National Stock Number assigned to this part is 1660000951129, and the Federal Supply Class is 1660 Aircraft Air Conditioning Heating And Pressurizing Equipment. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like FR3B1.