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 x 3.2cm/2.2 x 1.2inch Package list: 1 x Switch Note: make sure you control the air flow you desired before connect the switch with regulator. 1,Made of good quality plastic, wear-resistant, corrosion-resistant, durable. 2,Nice hand feeling, anti-skid to hold, smooth to adjust. 3,Manually control the On/Off of CO2 regulator. 4,Easy to install and use, just cut the pipe and plug it onto the gasket of the valve switch. 5,Fits 6mm pipe, suitable for aquarium. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.