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 to avoid accidental flooding during transportation of your pack. This particular valve is suitable for all Osprey Hydraulics Reservoirs from 2013 onwards (1/4” hose)