Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number ENL20SS found under Valve Restrictor Ch by Deltrol Corp. The National Stock Number assigned to this part is 4820011430093, 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 ENL20SS.