Description: 【PREMIUM MATERIAL】: The Aquarium Co2 valve is made of alminum alloy materials, very sturdy. This product is only for CO2, ordinary oxygen pump have lower pressure and may not be used. 【HIGH PERFORMANCE】: This 1 way check valve is anti leak and non backflow. Aquarium water valve is designed to prevent the aquarium from water flowing back because of maintenance, improve the service life of your carbon dioxides bottle. 【FOR CO2 EQUIPMENT】: The check valve is suitable for Aquarium CO2 system aquarium CO2 and NOT for air pump. 【EASY TO USE】: Our aquarium CO2 regulator is light in weight and compact in size, exquisites and small, smooth and flat surface, easy to clean. 【PACKAGE INCIUDE】: 1 Co2 valve only, other accessories is not included in the package. This CO2 bubble counter check valve is a great gift for family and friends who loves fishes breeding.  Specification: Material: Aluminum Alloy Size Chart: 3.7cmx1.5cmx1.5cm/1.46inchx0.59inchx0.59inch Package Includes: 1 Aquarium Check Valve Note: 1. Please allow slightly error due to manual measurement. 2. Due to the difference between different monitors, the picture may not reflect the actual color of the item. 3. Wish you a wonderful online shopping!