ADA PS Y Y Branch Blue Aquarium CO2 Diffuser - High Efficiency CO2 Dissolver for Planted Tanks | Perfect for Freshwater Aquariums & Aquatic Plant Growth

Joint parts used for delivering CO₂ to multiple distributing lines. It is used when supplying CO₂ into several aquarium tanks from a large CO₂ bottle, or placing multiple diffusers within a large tank in order to improve diffusion efficiency.

Please note item colour is blue, not black as depicted below.