Get current pricing for Oem, OEM-19845-ID Is An Unused Flex Hub Made By Koppers (now Kop-flex), Part Number 789382-1. Size # 1.5 Bore: 1.437 / 1.438 Inches 2 Keyways Keyway: 0.2 X 0.0 . Product Category: Process Equipment, Sub Category: Process Miscellaneous: