Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 6B-2621 found under Lower Plug Head Val by Hammel Dahl Inc. The National Stock Number assigned to this part is 4820011877112, 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 6B-2621.