Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number RW3 820491-1 found under Dirt Excluder by David Brown Gear Systems Limited. The National Stock Number assigned to this part is 5342011963825, and the Federal Supply Class is . Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like RW3 820491-1.