Item Type: Air Bubble Disc Material: Stainless Steel Diameter: Approx. 38mm/1.50in Applicable Hose Diameter: Approx. 4mm/0.16in Applicable Fish Tank: 40cm/15.7in 1Highly Efficient: Aquarium air stone disc bubbler atomizes delicately, and air cleaning is more efficient. 2Widely Used: The aquarium bubble stone is a great way to add oxygen to your aquarium, fish tank, hydroponics, and circulation system. 3Oxygenation: Aquarium bubble stone has high oxygen efficiency and quickly supplies oxygen to the aquarium. 4Long Term Use: The aquarium air stone disc bubbler can be cleaned after use and used multiple times. 5Practical Accessories: Aquarium bubble stone provides oxygen to water, which is good for the health of aquatic life, add beautiful round air stones to your display aquarium.Manual measurement please allow some error. 1 xAirBubbleDisc 1 x Check Valve 1 x Trident Tube 1 x Suction Cup 1 x Adjustment Switch