The Contigo Autoseal Randolph Replacement Lid features a one-touch Autoseal button, with button lock, that automatically seals between drinks to protect against spills and leaks.The button toggles to lock and is conveniently located on the handle, which helps prevent accidentally pushing the button on-the-go.At the end of the day, the mug lid pivots open for easy cleaning, and is top-rack dishwasher safe too.The Contigo Randolph Replacement Lid is compatible with 470ml travel mug.