High-flow oil sucker, the actual inner diameter of the tube is 13mm, outer diameter is 17mm, after connecting with the airbag, the outer diameter is 20MM. Thickened tube wall, designed flow rate is 10 liters per minute. Large spherical body, good suction force, large flow rate, thickened spherical design, more durable! Longer service life! It is equipped with a bidirectional check valve device, which makes operation simpler and more convenient. Just squeeze a few times to get oil, and it can also self-flow! It needs a certain drop to self-flow, the larger the drop, the larger the flow!