Aquarium Water Plant CO2 Non-Return Bubble Counter Fish Tank Tool (Double Head)Do you want to enhance your fish tank setup? Our newly designed carbon dioxide bubble counter is a reliable choice for monitoring CO2 levels in your aquarium. Constructed from durable materials, this bubble counter features a non-return function to prevent backflow during pressure changes, helping protect your water plants and CO2 system. It allows you to clearly monitor the volume of carbon dioxide being released and ensures your aquatic plants receive sufficient CO2 for healthy growth.Features:- Made of high-quality materials for durability and reliability - Includes non-return valve to prevent backflow when pressure fluctuates, helping protect your aquarium system - Enables accurate monitoring of carbon dioxide output to support optimal plant growth - Easy to install and use, ideal for enhancing your aquarium environment - Available in double head and single head options to suit your specific needs Specifications:- Condition: New - Item Type: Bubble Counter - Material: Aluminium Alloy & Acrylic - Color: Silver - Optional Types: Double Head, Single Head - Double Head Size: Approx. 8.2 x 2 cm / 3.2 x 0.8 inch (L x D) - Single Head Size: Approx. 8 x 2 cm / 3.1 x 0.8 inch (L x D) - Package Weight: Approx. 32–34 g Installation Instructions:Single Head Bubble Counter: 1. Place the seal ring onto the tubing connector of the valve, then securely attach the bubble counter. 2. Fill the chamber with water up to 4/5 full, tighten the top cap, insert the CO2 tubing, and secure the tubing nut.Double Head Bubble Counter: Fill both chambers with water up to 4/5 full, tighten the top cap, insert the CO2 tubing, and secure the tubing nut.Package Includes: 1 x Bubble Counter