Features 1. Spill-Proof: Won't drip, spill, or leak 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 jug cap to be put on or taken off easily, 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 stays attached to the cap when placed, instead of floating around in the water; also for water jug on the top shelf or with water pump in both 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 hassle and irritation. Just press down on the top to install it, and then pry it up to remove it. It's so easy that 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 Cap or 4 Water Bottle Cap