Features 1、Breathing Valve Head: Ensures stable breathing with constant pressure upgrading, external explosionproof valve for safety, smooth breathing for more enjoyable snorkeling experience. 2、Sturdy: Made of aluminum and silicone, which has high strength, sturdiness and durability, providing a safe and comfortable diving experience with effective resistance reduction and smooth breathing design. 3、Versatile Use: Diving oxygen cylinder breathing valve head can be used in deep and shallow waters, a must have accessory for your diving gear with M18x1.5MM bottle interface model. 4、Easy Installation: Designed for diving enthusiasts, suitable for different scuba equipment, precise airflow control for steady breathing and good waterproof performance. 5、Comfortable Breathing: Lightweight and easy to breathe with unique design, ensuring a smooth and enjoyable diving experience for users of all levels. Wonderful accessories for diving, snorkeling, etc., deeply loved by diving enthusiasts. Item Type: Diving Oxygen Cylinder Breathing Valve Head Material: Aluminum, Silicone Weight: Approx. 666g / 23.5oz Screw Size: M18x1.5MM Package List 1 x Diving Oxygen Cylinder Breathing Valve Head 2 x Fluorine Rubber Ring 1 x Screwdriver 2 x Instruction Manual