Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 230-0-001 REV B ITEM NO.4 found under Tow Line Fairlead by Maritime Applied Physics Corporation. The National Stock Number assigned to this part is 3940016027137, and the Federal Supply Class is 3940 Blocks Tackle Rigging And Slings. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 230-0-001 REV B ITEM NO.4.