I’ve used loads of different hydration reservoirs over the years & find the Osprey system to be one of the best. This bite valve just works superbly, always providing a high flow rate to slake your thirst. The whole valve rotates to securely shut off the flow completely. The valve body has a magnetic base & is supplied with a sternum strap magnet so you can easily locate your bite valve for instant hydration; it also stops the valve flapping about during activity. This particular valve is suitable for all Osprey Hydraulics Reservoirs from 2013 onwards (1/4” hose)