Glass CO2 Diffuser for Aquarium Planted Tanks, Big and Small

PRODUCT FEATURES Made of High-quality GlassEfficient CO2 atomisation through Ceramic Membrane (Non-replaceable) Tube is not included.Two option for choice.* big one -1.5 inch (40 mm) in diameter, comes with two suction cups. Ideal for 20 Gallon or bigger aquarium tanks.* small one - 1 inch (25mm) in diameter, comes with one suction cup. Ideal for nano tanks.