Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number B780 28207HRR found under Valve Ball by Hbd Industries Inc. The National Stock Number assigned to this part is 4820012541513, 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 B780 28207HRR.