4 Packs Bite Valve Replacement Sheath for Water Bladder, Packs Hydraulics Reservoirs, 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 x 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.