Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number W3626A2003 found under Valve Air Four Way by Ross Operating Valve Co. The National Stock Number assigned to this part is 4820008134453, 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 W3626A2003.