Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number D3552 1 1 2IN M found under Valve Angle by P J Valves Inc. The National Stock Number assigned to this part is 4820010172600, 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 D3552 1 1 2IN M.