Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number S6165-61523-045 found under Valve Assembly by Rotair Industries Inc. The National Stock Number assigned to this part is 4820010145005, 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 S6165-61523-045.