Fit for 2.17in water bottle: This water jug caps fit for 2.17in water bottle with screw thread,Inner caps design turn the non-spill caps into reusable and replacement Upgrade Non-Spill Plug : Upgrade Non-Spill Plug system, no splash, no leak, sealing strong than general caps, clean and safe to create a sterile environment for crystal-clear water storage Grade Plastic Materials: The water bottle cap made of food grade plastic material, this cap is safe, harmless and reusable Modern Design: Simple and modern design, easy to screw on.A good replacement of the damaged or lost cap, keep your water clean while stored Money Saving: Say no to lots of disposable water caps, refill your water jug for recycling use and saving money