Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 73C4 found under Valve Linear Direct by Auto Valve Inc. The National Stock Number assigned to this part is 4820015757242, 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 73C4.