A great upgrade that not only prevents spills (just twist the collar to open or close) but also features a convenient 90 degree angle and high flow rate for fast and easy hands-free hydration.
Fits Platypus Hoser and Big Zip SL hydration bladder systems. Whip off the existing bite valve, insert the shutoff valve into the tube then re-fit the bite valve and its fitted. You now have your hydration at a more natural angle and you can shut it off when its not in use. People who use bite valves a lot will realise how easy it is to dump your rucksack on it and allow water to come pouring out.