Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 21388N PC 18 4 found under Stem Fluid Valve by Leslie Controls Inc. The National Stock Number assigned to this part is 4810015343038, and the Federal Supply Class is 4810 Valves Powered. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 21388N PC 18 4.