These are Camelbak hydrolink conversion kits. These kits replace the existing valves on compatible hydration hoses that use Hydrolink components. They fit Omega, Long Neck Waterbeast, and other systems. These kits are great for replacing your dirty old mouthpieces, and they allow you to easily replace the valve.
This kit includes Hydrolink, Hydrolock, and the Hydrolink Bite Valve Adapter with a Big Bite Valve.
Hydrolock keeps your water inside the bladder, where it belongs. You can use the Bite Valve Adapter to bypass the valve at the base of the mouthpiece, which allows you to access your water FAST.