Amazon.com : JMTEEA Bite Valve Replacement Mouthpiece Fit for Hydration Pack Bladder Water Backpack and Most Brands(4-Pack), with Shutoff Valve and Tube O-Ring : Sports & Outdoors
Amazon.com: Aquatic Way Bite Valve Replacement Mouthpieces fits Camelbak and Most Brands (4-Pack), with Shutoff Valve and Tube O-Ring for Hydration Bladder and Backpack Water Reservoir : Sports & Outdoors
Amazon.com: Hydration Water Bladder Bite Valve Mouthpiece Replacement - Leak-Proof, Easy-to-Use Pull/Push Shutoff Valve with Dust Cover - Compatible with Hiking Water Backpack with Bladder or Hydration Pack : Sports & Outdoors