2-year replacement service： If the cap is damaged or tear within 2 years, it can be replaced with new one, You can contact us by opening an Amazon order and finding the 'Contact Seller' button. You don't need to send the old back, contact us to directly sent you a new one! Made of 100％ food grade silicone BPA Free, Sturdy & Durable. High temperature resistant, Dishwasher safe. Cover the bottle mouth with the silicone cap and then install the water pump, which can help the water pump grip the bottle mouth more firmly. Fits for 3-5 gallon water bottle with 55mm-60mm/2.16in-2.36in opening , The caps are flexible and pretty tight, sealed perfectly. Easy to use and install.You can take off our caps with your finger easily. Reusable water jug caps.Stop use one time plastic caps, which can save a lot of money. Great solution for indoor and outdoor water store, water dispenser caps, water jug caps for refill. 3-5 Gallon Water Jug Cap Reusable, Silicone Replacement Cap, Non Spill Bottle Caps for 55mm Bottle Water Dispenser Caps