Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 909 OSY-RW-BB-3.00IN found under Valve Backflow Prev by Key Industries Inc. The National Stock Number assigned to this part is 4820014449735, 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 909 OSY-RW-BB-3.00IN.