Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number PP21237-3 found under Seal Neoprene by Acco Industries Inc. The National Stock Number assigned to this part is 5330003511629, and the Federal Supply Class is 5330 Packing And Gasket Materials. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like PP21237-3.