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 makes the water jug cap easy to put on or take off, and the hanging ring design made 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 dispensers, water coolers, the center button is fixed on the cap when placed, instead of floating around in the water; also for top shelf water jug or with water pump both in family and office. 5. Easy to Install/Remove: Unlike plastic caps, the jug can be put on or taken off in a second, saving you the hassle and irritation. Just 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: 45g, 95g Package Include: 2 water bottle caps or 4 water bottle caps