My original bite valve leaked most of it's life, so I was sceptical about replacing it with the same style. After I made the switch all I could think was why did I wait so long..!! It was a snap to switch out (took longer to pull the old one off than to put the new one on), and it doesn't leak..!! I've tried bite valves with a shut-off valves and they work, but I'm too lazy to turn a valave on and off for every drink. A bite valve is the right fit for me.