Aquarium Co2 Bubble Counter & Check Valve Regulator For Single Or Dual Head Air. Elevate Your Aquarium with Our Expertly Crafted CO2 Bubble Counter, Designed to Enhance Plant Growth and Maintain a Healthy Aquatic Environment. Constructed from High-quality Aluminum Alloy and Acrylic, This Durable and Reliable Device Features a Non-return Function to Prevent Backflow, Ensuring the Safety of Your System. Clearly Observe the CO2 Output and Provide Your Plants with Optimal Carbon Dioxide Levels for Robust Growth. Easy to Install and Available in Both Single-head and Dual-head Options to Suit Your Specific Needs, It's the Perfect Choice for Making Your Fish Tank Stand Out. Features: - Premium Materials: Made from Durable Aluminum Alloy and Acrylic for Long-lasting Use. - Non-Return Function: Prevents Backflow, Protecting the Water Plant Table and CO2 Bottle. - Precise CO2 Measurement: Accurately Counts the Volume of Carbon Dioxide for Optimal Plant Supply. - Easy Installation: Simple Installation Process with Clear Guidelines. - Customizable Options: Choose Between Single-head and Dual-head Designs to Fit Your Setup. - Material: Aluminum Alloy & Acrylic - Available Types: Double Head, Single Head - Double Head Size: 8.2 X 2 Cm / 3.2 X 0.8 Inch (L X D) - Single Head Size: 8 X 2 Cm / 3.1 X 0.8 Inch (L X D) - Package Weight: 32–34g Installation Method: - Single Head: Attach the Seal Ring, Fill 4/5 of Bubble Counter with Water, Connect CO2 Pipe and Secure. - Double Head: Fill 4/5 of Bubble Counter with Water, Connect CO2 Pipe and Secure..