Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 575B-6AS found under Cock Poppet Drain by Auto Valve Inc. The National Stock Number assigned to this part is 4820002036321, 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 575B-6AS.