Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number R63870C16E6168-2 found under Valve Pneumatic Tank by Unifab Industries Inc. The National Stock Number assigned to this part is 4820009362235, 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 R63870C16E6168-2.