Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number BY38920A 316SSTL found under Plug Rotary Valve by Duriron Co Inc. The National Stock Number assigned to this part is 4820011923629, 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 BY38920A 316SSTL.