Features: Large flow, stable performance, and high efficiency. The water pump flow rate varies depending on the power and speed of the electric drill used. EASY TO USE: The self-priming transfer pump is compact, self-priming, and battery-free, suitable for professional use. Simply attach an electric drill to achieve a steady and fast flow of 20-30 liters per minute. NO BATTERIES OR ELECTRICITY REQUIRED: This pump does not require batteries or external power. Connect it to your electric drill to pump water, oil, and other compatible liquids. The hex shank is compatible with various drill chucks. WIDE RANGE OF USES: Suitable for transferring light liquids such as freshwater, seawater, oil, pesticides, and liquid fertilizers. EASY TO CARRY: Compact design for convenient portability and storage. NOTICE: 1. Actual color may vary slightly from the image due to different lighting conditions. 2. Please allow 1-3 cm deviation due to manual measurement. SIZE: Approximately 12.5 x 6.3 cm Inner diameter of water inlet/outlet: 16 mm Outer diameter of water inlet/outlet: 19 mm (compatible with 6 mm hoses)