Gravity-tank covers and locking devices fit atop the tank of a gravity-flush toilet to protect the flushing mechanism from debris and damage. The covers conceal interior components to provide a finished look. The locking devices secure a cover to the toilet tank to prevent tampering in restrooms where there's an increased risk of vandalism.,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.