Genuine Gerber 99-685 trip lever in chrome finish. This trip lever for the Left Hand Side of the toilet when facing the toilet. This lever does come with the nut to hold it onto the tank. The nut will be reverse thread. This lever also replaced Gerber genuine 99-664. Other part numbers are G0099664, 0099664, 99644, G0099685, 0099685, 99685.