100% brand new and high quality 20/30/45/60/75cm Air Stone Bubble Bar Wall Curtain Tubular Hose for Aquariums Air Curtain Hoses is a porous rubber hose with good softness, and any required shapes can be realized. The bubble disperses evenly and the oxygen supply is excellent. Great for decorating and supplying all types of aquariums Suitable for aquariums and aquariums Ideal for fresh/tropical and saltwater aquariums as well as reptile habitats. Color: Black Length: 20cm/7.87inch, 30cm/11.81inch, 45cm/17.72inch, 60cm/23.62in; 75cm/29.53" Connector Size: 0.35x 0.27cm/ 0.14" x 0.11" (Outer Diameter * Inner Diameter) Pipe Size: 1.2x 1.0cm/ 0.47" x 0.394" (Outer Diameter * Inner Diameter) Quantity: 1Pc Tips & Steps:1. Firstly, connect the rubber hose to check the outlet valve with 0.35mm air tube, then connect it to the air pump with 0.35mm air tube and steep it into the water. When enabled, equal bubbles can be dissipated immediately.2. After prolonged use, the holes on the surface may become blocked. Soak it in hot water for about 8 minutes, then use a brush or cloth to lightly rub the surface. A single lampshade marks air-permeable holes at one end, the other end is sealed. Note: Size for manual measurement, there may be 0 to 2cm error, belongs to the normal phenomenon. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package Included: 1Pc x Air Bubble Making Tube