Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number GR-0250W0A10016-D3S00S0E000KB found under Valvebutterfly by Keystone Intl Inc. The National Stock Number assigned to this part is 4820016961618, 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 GR-0250W0A10016-D3S00S0E000KB.