Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number BH-00004-002 found under Valve Diaphragm Sto by Raytheon E Systems Inc. The National Stock Number assigned to this part is 4820014371058, 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 BH-00004-002.