Notice: Dear friends, thank you very much for liking our products. Please note that the product image you see on each link represents exactly what you will receive. If you select an image of a single part or component, that specific item is the only one included in the order; other accessories or accompanying parts shown in the photo (for demonstration purposes) are not included unless they are specifically listed in the product title or description. For detailed information, please refer to the webpage instructions. All products are made from molds, so there may be a slight variation between each product, with an error range of 1-3mm.  Instructions for useLubricate the inner wall of the cylinder and yourself. Insert your penis into the cylinder. The cylinder should remain firmly pressed against the base of your penis to keep air from escaping.Slowly begin to work the pump. There will be a slight sensation as air is drawn from the cylinder. For beginners, it is important to start this process slowly to avoid discomfort. Remember to press the safety release valve if the vacuum becomes painful. Continue pumping/releasing air until you've found a level of vacuum suitable for you: the penis should look swollen, but should not hurt.Now make sure no air escapes (unless needed) and wait 20 minutes. You may need to pump further during this time to keep an appropriate amount of vacuum in the cylinder.Once the session is complete, you should appear thicker/longer and have heightened sensitivity. These results are effective for 24 hours, but you may experience permanent results through long-term use. We recommend 3-4 sessions per week.   Penis enlargement pump sizes ModelA:46-230mm/1.75-9inch Model B:52-230mm/2.0-9inch Model C:59-230mm/2.25-9inch Model D:64-230mm/2.5-9inch Model E:46-305mm/1.75-12inch Model F:52-305mm/2.0-12inch Model G:59-305mm/2.25-12inch Model H:64-305mm/2.5-12inch The material is made of environmentally friendly acrylic blocks, which can be used with confidence Easy  Release  Connector  Instructions 1.To connect the tubing,press and twist the connector at the end of the tube.       2.When you hear the click,the tubing is fully inserted.       3.To remove,push the metal tab inward and pull the tubing at the base.Youcan remove the tubing and pump while maintaining pressure in the cylinder. Pump Instructions:       Puller, negative pressure gauge, leather tube, acrylic cylinder, silicone gasket The acrylic tank comes with a seal switch, after removing the link pipe can still maintain negative pressure.