Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 799-D-13343 REV D FN 41 found under Valve Check by Aqua Chem Inc. The National Stock Number assigned to this part is 4820015421981, 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 799-D-13343 REV D FN 41.