Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 44B3721-467D found under Seat Valve by Carrier Corporation. The National Stock Number assigned to this part is 4820011705363, 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 44B3721-467D.