Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number RB17749 found under Disk Valve by Crane Company. The National Stock Number assigned to this part is 4820009389972, 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 RB17749.