Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 6441749-01M1 found under Valve Hand Bypass by Bae Systems Survivability Systems Llc. The National Stock Number assigned to this part is 4820015957205, and the Federal Supply Class is 4820 Valves Nonpowered. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 6441749-01M1.