Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number RK304 found under Tape Adhesive Rubber by Armstrong World Industries Inc. The National Stock Number assigned to this part is 9320002271561, and the Federal Supply Class is 9320 Rubber Fabricated Materials. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like RK304.