A double action hand pump is designed to transfer fluids efficiently by using both the upward and downward strokes of the piston. This dual-action mechanism allows fluid to be moved during both strokes, providing faster and more consistent flow compared to single-action pumps. Commonly used in industries like agriculture, automotive, and construction, these pumps are ideal for transferring liquids such as water, oil, fuel, and chemicals. They are known for their durability, ease of use, and versatility, making them a reliable choice for various applications where quick fluid transfer is needed.