Feature: 1. Corrosion Resistant: Fish tank oxygen refiner, made of highly transparent glass, resistant to acids and alkalis, corrosion resistant. 2. Anti Clogging: Aquarium bubble diffuser can be decomposed into fine and small bubbles, use without clogging, even water flow. 3. Widely Applicable: Highly transparent glass fish tank bubble diffuser, high density dissolved oxygen and carbon dioxide can be used. 4. Powerful Suction Cups: Aquarium air refiner is equipped with high suction cups, firmly fixed, not easy to slip off, easy to use. 5. Beautiful Workmanship: Aquarium bubble stone diffuser is formed in one go and poured using a mould to avoid handcrafted errors. Specification: Item Type: Aquarium Bubble Diffuser Material: Glass Size: Approx. 9.5 x 3.3 x 5cm / 3.7 x 1.3 x 2in. Package List: 1 x Refiner 1 x U Tube 2 x Suction Cup 1 x Check Valve1 x Regulating Valve Note: Manual measurement, please allow some errors.