GREATEST COMPATIBILITY - The bite valves are compatible with most common hydration bladders brands in addition to our popular J., CARP Hydration Bladders. You have ZERO RISK with buying from us. ~ Was your bladder working fine, but now leaks where the tube connects to the bladder? The O-ring in this kit might fix that! AXEN ON-OFF Switch Isırma Valfi Tüp Nozulu Hidrasyon Paketi Kesesi İçin Yedek (M Don't let that make you throw away an otherwise perfect water bladder! O-ring- O-rings are easy to lose and this makes a perfect bladder useless. Use This Kit to Solve Most Common Hydration Bladder Problems~ Mouthpieces wear and tear, no matter how best you use them. This replacement O-ring comes in very handy if you ever get in that situation. SELF-SEALING BITE VALVES have one-piece construction so there are no water drips. If you lost or broke yours, you no longer need to replace the entire bladder. ~ Did you break or lose your mouthpiece nozzle? This kit fixes that too! If you don't like our product FOR ANY REASON, simply contact us and WE WILL HONOR OUR GUARANTEE. MOUTHPIECE NOZZLE with ON/OFF Shut Off Valve: Easily control water flow with the yellow lever. Simple attach this nozzle to the drinking hose and mount the mouthpiece AXEN Bite Valve Replacement Mouthpieces (4-Pack), 2PCS Shutoff Valves, And 1PC O-Rings Kit For Hydration Bladder And Water Backpack Bladder Reservoir, Compatible With Most Brands Check dimensions in image. There are FOUR (4) mouthpieces included in the package so you can use your backpack reservoir for a long time Compatible with drinking tubes and bite valves of most hydration bladders. Buy with confidence with our no-questions-asked 60-DAY FULL REFUND Guarantee.