Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 17720233A 200MM IT4 found under Stem Fluid Valve by Seffle Marine Ltd. The National Stock Number assigned to this part is 4820014262403, 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 200MM IT4.