Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number SWA-SN-45989 found under Regulator Thermosta by Richards Industries Valve Group. The National Stock Number assigned to this part is 4820012197809, 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 SWA-SN-45989.