Gravity-tank trip levers are replacement components for the handles used to trigger flushing of gravity-flush toilets. They're used to replace levers that have loosened, are sagging, or no longer activate flushing.,Gravity-tank repair parts help fix leaks and restore proper flushing on gravity-flush toilets to avoid the expense of replacing the entire toilet. These toilet tank parts are used to replace broken or worn parts on gravity-fed tanks commonly found in homes, multifamily residences, hotel rooms, and other low-traffic settings (20 to 30 flushes per day). Signs that a toilet tank needs repair include leaking, constant running, and failure to flush.