Packs Hydraulics Reservoirs 4 Packs Bite Valve Replacement Sheath For Bladder Hydration Pack Comes with 4 bite valve silicone sleeves, each containing an inner post. Bite Valve Replacement Sleeves: Use these bite valves to replace old and leaking bite valves on your water bag; it fits most and types of water bags, for Packs Hydraulics water bag compatible. Premium Silicone: Made of high-quality silicone, with good durability and elasticity, odorless and free of harmful substances, providing you with a soft bite, allowing you to sip easily and drink healthily. Wide Application: Fits most of water bags and water bags of different capacities; it is a good replacement for bite valves whether you are cycling, running, hiking or other outdoor adventures. Colour:Transparent-Red Material:Silica gel Package Contents: 1 set * Soft water bottle spout Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.