Contigo Autoseal Aria Replacement Lid, Black/Gray This lid features patented "Autoseal" technology, eliminating spills and leaks Just press the button to sip; release the button to automatically seal Button toggles to lock, preventing accidentally pressing the button while on the go This lid fits the 16 oz. and 20 oz. Aria Autoseal Stainless Travel Mugs If your travel mug does not currently have a button that slides down to lock, this lid will not fit your mug