We have a couple of Contigo travel mugs. On ours, the valve assembly is on an axle, and can be pivoted down from the lid to clean. The first time my g/f saw one of these for sale, the valve had been flipped down, she thought it was broken, and took it up to the cashier. "Oh, no, it's fine. <flip>"I have Contigo but one HUGE flaw with them. The channel your beverage flows through is impossible to clean no matter how hard you try and they get pretty disgusting after awhile