Features 1. Spill-Free: No drips, spills, or leaks even if you store your jugs on their side. Fits any jug with a standard 55mm opening, 5-gallon jugs. You can even use it for threaded screw-top jugs if you want. 2. Upgraded Design: Unique design allows the water bottle cap to be easily put on or taken off, and the hanging ring design makes it easy to hold. 3. Food-Grade Silicone: Food-grade silicone provides an airtight seal and won't leach any harmful chemicals into your water, ensuring your drinking water stays pure and fresh for as long as you store it. 4. Multiple Occasions: Suitable for water dispenser, water cooler, the center button stays attached to the cap once placed, instead of floating around in the water; also for top-shelf water pitcher or with water pump in both family and office. 5. Easy to Install/Remove: Unlike plastic caps, the jug plug can be put on or taken off in a second, saving you hassle and irritation. Simply press down on the top to install it, then pry it off to remove it. It's so easy even a child can do it. Specification Material: Silica gel Color: Blue Size: 5.5x5.5x2cm Weight: 45 g, 95 g Package Include: 2 Water Bottle Caps or 4 Water Bottle Caps