Camelbak Crux Reservoir On/Off Valve - The CamelBak Crux reservoir on/off valve pairs with the Big Bite valve, shutting off the water flow for added security during transport. Please note: this On/Off Valve does not ship with a Big Valve and it is NOT compatible with older style Antidote or OMEGA; reservoirs. Features Ergonomic on/off valve make it easy to grip tube and toggle while you're on the move Turn off water flow from CamelBak Crux Reservoir during transport 45-degree bend perfectly positions the Big Bite Valve for easy drinking The patented Big Bite Valve mouthpiece offers Hands-Free Hydration and is ideal for any high-performance situations. Self-seals after each drink to eliminate annoying drips.