1. First connect the rubber hose to the outlet of the globe valve through an air tube with an inner diameter of 3mm, and then connect it through an elastic tube with an outer diameter of 16mm 2. After prolonged use, the holes on the surface may be blocked. It needs to be cleaned up in time. 3. You can change the shape of the tube to connect according to your needs 4. Lightweight and easy to carry 5. Easy to use and get started quickly colour: red Material: latex size: 50cm; inner diameter 3mm outer diameter 16mm Package Contents: 1* underwater speargun Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.