Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 1600-W-2IN found under Valve Vent by Robert H Wager Companyinc. The National Stock Number assigned to this part is 4820011223397, 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 1600-W-2IN.