The Bestway Air Step 300 ML hand pump inflates tubes, air mattresses, inflatable boats, toys, and other inflatable items, and allows them to be deflated as well. It is designed to provide maximum airflow, has a stroke volume of 0.3 L/cycle, and features a large air chamber for quick inflation. With each downward stroke, it delivers a continuous airflow. It is ideal for situations where you don't have access to electricity and need to inflate your items on the go. Additionally, three universal valve adapters are included, which fit almost any inflation valve, allowing you to inflate a variety of items with the same pump. With its compact design, the Bestway Air Step 300 ML hand pump is perfect for travel when you need to pack light.