Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 4DP 2039 PIECE 21 3 4IN found under Seal Insert Valve by The Walworth Company. The National Stock Number assigned to this part is 5330011923432, 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 4DP 2039 PIECE 21 3 4IN.