Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 189225E REV3 found under Pressurizer by Babcock And Wilcox Co. The National Stock Number assigned to this part is 4470001828858, and the Federal Supply Class is . Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 189225E REV3.