Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 17720233A 65MM SH IT18 found under Roller Valve by Halla Hydro Ab. The National Stock Number assigned to this part is 4820014338706, 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 17720233A 65MM SH IT18.