This universal, manual water pump is compatible with most bottles between 2 and 6 gallons. Durable materials are used to form a high-quality cylinder case that will keep the pump in top shape. The lower tube can be adjusted to fit any bottle size, making it a versatile and convenient product. Cleaning this product is a breeze with the included tube brush, so consumers can use the pump without worries of bacteria buildup and contamination. This portable pump has no motor or battery requirements. It is 100% manual and is easy to install.