Product Description Size: Inner Diameter 0.78 inch (20 mm), Outer Diameter 1.04 inch (26.5 mm). Package includes 1 pipe fitting. Designed for precise compatibility with acrylic and PVC pipes that have an outer diameter of 20 mm (0.78 inch). Material: Crafted from transparency acrylic featuring a polished, smooth surface. Crystal clear walls provide easy visual inspection of internal flow. Reinforced structure offers pressure resistance and longterm durability. Integrated Filtration: Builtin system promotes continuous water circulation while filtering out impurities, reducing the need for separate filtration equipment and helping maintain clean water conditions. Optimized Water Flow: Strategically positioned openings deliver strong permeability, ensuring efficient water movement while safely containing aquarium inhabitants. Ideal for: 1. Freshwater or marine aquariums, allowing visual monitoring of water clarity and protecting aquatic life. 2. Aquatic research or breeding setups where gentle yet effective water circulation is essential. 3. Water feature installations requiring both mechanical support and unobstructed flow. This pipe fitting offers a reliable, durable, and clear solution for aquarium and water system applications, combining robust construction with practical functionality to support healthy aquatic environments.