This switch can help users control the output of CO2 precisely so as to save the efforts to adjust the regulator everyday and prolong the service life of regulator. Features: Made of good quality plastic, wear-resistant, corrosion-resistant, durable. Nice hand feeling, anti-skid to hold, smooth to adjust. Manually control the On/Off of CO2 regulator. Easy to install and use, just cut the pipe and plug it onto the gasket of the valve switch. Fits 6mm pipe, suitable for aquarium. Specification: Material: Plastic Color: as picture shown Size: 5.6*3.2cm/2.2*1.2inch Package list: 1 x Switch Note: make sure you control the air flow you desired before connect the switch with regulator. 1Made of good quality plastic, wear-resistant, corrosion-resistant, durable. 2Nice hand feeling, anti-skid to hold, smooth to adjust. 3Manually control the On/Off of CO2 regulator. 4Easy to install and use, just cut the pipe and plug it onto the gasket of the valve switch. 5Fits 6mm pipe, suitable for aquarium.