Key benefits — why you need this part Improves water circulation and increases dissolved oxygen, preventing dead spots and supporting healthier fish, invertebrates and plants. Secure, threaded connection keeps the fitting in place so you get reliable flow without leaks or shifting. Easy to remove and clean, reducing maintenance time and preventing clogging that lowers system performance. What it does Designed to create effective water circulation that raises oxygen levels in the tank water. Compatible with both freshwater and marine setups, including new tanks where establishing stable oxygenation is critical. Supports planted aquariums by promoting nutrient exchange around roots and preventing stagnant pockets. Compatibility and size Fits pipes with an inner diameter of 18 mm or an outer diameter of 24 mm. Use with tubing or rigid pipe that matches these dimensions for a proper seal. Threaded pipe connection for firm attachment to compatible plumbing. Practical performance and maintenance Delivers consistent circulation to help maintain stable water chemistry and improve overall tank health. Simple assembly and removal make routine cleaning and inspection quick and easy. Use scenarios Planted freshwater tank: Install on circulation lines to move water gently through substrate and root zones, helping plants access oxygen and nutrients. New marine or reef tank: Use during early cycling and stocking to maintain oxygen levels and encourage biological stability. Small to medium aquaria with external filter or pump: Attach to piping to eliminate stagnant corners and improve filter efficiency. Why choose this fitting Clear, specific compatibility (18 mm ID / 24 mm OD) prevents guesswork when matching plumbing. Threaded connection ensures a secure, leak-resistant installation. Practical design focused on improved oxygenation, easy maintenance, and suitability for both freshwater and saltwater planted systems.