brand new and high quality Features: Brand new and high quality, easy to be connected to hose. Two-way plastic for valve can be used as an in-line for valve to control air flow from pump. Fit standard air line tubing aquarium and CO2 tubing with inner diameter about 4 mm. Help to increase oxygen and keep air for fresh, create healthy environment for your fish. Specification: Material: Plastic Color: White/Yellow/Gray Usage: Adjustment Size: 4.5*2cm/1.77*0.79in(shown as the picture) Caliber: 4mm Quantity:1 PC (No retail package) Note: Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!!! Compare the detail sizes with yours, please allow 1-4CM differs due to manual measurement, thanks! Package includes: 1 X T-Shaped Air Switch for Valve Regulator