The CamelBak® CRUX reservoir on/off lever pairs with the Big Bite valve, shutting off the water flow for added security during transport. *This product is the lever only. Bite Valve Not Included* Key FeaturesWorks with all CRUX reservoirs 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 BPA, BPS and BPF free 6cm / 2.5 inches in length