Warning: This drinking water pump is suitable for gallon barrels with a 2.16 inch (5.5 cm) neck. Please confirm the neck size before purchase. 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 ecological. Rechargeable by USB: Large capacity built-in rechargeable battery. Once 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 perfectly fits the carafe or bottle with a capacity of ( 2 gal/7.5 L). (3gal/11.3L). (4 gal/15 L). (5 gal/19 l). Easy to use: Just attach the small pump to the neck of the bottle or use it on the desk. Once you press the switch. you can use it. It is the best choice for offices. the houses. the kitchens. the schools. etc The removable water dispenser is suitable for outdoor / indoor use.