Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number RHD12L found under Valve Check by Metric And Multistandard Components. The National Stock Number assigned to this part is 4820001637435, 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 RHD12L.