Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number B4387A found under Valve Self Closing by Eaton Aerospace Ltd. The National Stock Number assigned to this part is 1615011142152, and the Federal Supply Class is 1615 Helicopter Rotor Blades Drive Mechanisms And Components. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like B4387A.