Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number NN72H4-93A found under Valve Guide by Transdigm Inc. The National Stock Number assigned to this part is 4820010528036, 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 NN72H4-93A.