Please note: This drinking water pump is suitable for gallon barrels with a 2.16 inch (5.5 cm) neck. Please confirm the neck size before purchasing. High-quality materials: This product is made of high-quality BPA-free plastic. The tube is made of food-grade silicone. It is healthy and environmentally friendly. USB rechargeable: Built-in large-capacity rechargeable battery. When fully charged, it can be used to extract 4 to 6 bottles of water for daily use and outdoor activities. Compatibility: The universal water dispenser fits perfectly with the jug or bottle with a capacity of (2 gal/7.5 L). (3 gal/11.3 L). (4 gal/15 L). (5 gal/19 L). Easy to use: Simply attach the small pump to the bottle neck or use it on the desktop. When you press the switch, you can use it. It is the best choice for offices, homes, kitchens, schools, etc. The detachable water dispenser is suitable for outdoor/indoor use.