KOHLER K-9379-2BZ Wellworth Trip Lever KOHLER finishes resist corrosion and tarnishing, exceeding industry durability standards two times. Metal construction for durability and reliability. This trip lever 9379-2BZ is only designed to work on specific current models of the Wellworth and Highline toilets, including models K-3999, K-3979 K-3889, K-3949, K-3998, K-3978, K-3948, K-3997, K-3977 and K-3947 Can be used for left-hand and right-hand tank configurations.