Description Description: It is made of tough stainless steel material, so it is durable and reliable. The air governor valve makes a wonderful decoration for the aquarium with its pretty look. Monitoring and regulating the amount of CO2 in your aquarium is essential to growing healthy and happy aquatic plants and pets. A necessity for aquarium: It can easily adjust the air volume in the air pump to ensure your fish has a comfortable environment. Regulator needle valve is lightweight and easy to operate. The precise structure of the needle valve features a special metal grinded surface and finely detailed threading for secure closure. Specifications: Type: single head/double head(optional). Material: stainless steel. Size: 4*2.6*1.5cm. Color: silver. Single head works with CO2 meter; double head is conneted with 2 hoses. Notes: Due to the light and screen setting difference, the items color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package include: 1 x Aquarium CO2 Bubble Counter Valve.