Features: Large flows, stable performance and high efficiency. The flowing rate of the water pump varies according to the power and speed of the electric drill used. EASY TO USE: The self-priming transfer pump is a compact, self-priming, battery-free borehole pump for professional use. Just attach an electric drill and the steady and fast flowing of 20-30 liters per minute is amazing. NO BATTERIES AND ELECTRICITY: The self-priming transfer pump requires no batteries. You simply attach your electric drill to this pump and its to pump water, oil and more. The hex shank of the drill pump is compatible with different kinds of drill blocks.Wide range of uses: suitable for transporting light liquids such as freshing water, sea water, oil, pesticides, and liquid fertilizers. Easy to carry: Compact design, easy to carry and store. Notice: 1. Actual color may be slightly different from the image due to differentlight effect. 2. Please allow 1-3cm deviation due to manual measurement. Size: Approximately 12.5*6.3cm Inner diameter of water inlet/outlet: 16mm Outer diameter of water inlet/outlet: 19mm (applicable to 6 pipes)