Feature: 1. Adopt premium plastic material, high strength, high-temperature, corrosion, and wear resistant. 2. Wide application, suitable for all kind of drainage manufacturing field, easy to use. 3. Meet your needs of water pipe diameter changing, good performance, reliable to use. 4. Multi-purpose, applicable to aquarium, fish tank, etc, sturdy and durable, long service life. 5. Small size and lightweight, exquisite workmanship, bringing great using experience. Specification: Item Type: Fish Tank JointCondition: 100% brand newMaterial: PlasticColor: TransparentApplication: Suitable for all kinds of water pipes and air pipesDiameter of Two Sides: Approx. 8mm/0.31in, 4mm/0.16in (manual measurement, 0.1mm-0.3mm error range). Package List: 20 x Connectors