Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 18974 found under Valve Flow Control by Tiffin Parts Llc. The National Stock Number assigned to this part is 4820004709869, 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 18974.