Feature:<br /><br />\u25cfYou can see CO2 bubble clearly out of gas and it supply C02 to the plants enough.<br />\u25cfIn prosperous plants aquarium, we recommend a second play 2-3 CO2 bubbles.<br />\u25cfReplaceable parts design approach, self-maintenance easily.<br />\u25cfPlease pay attention to the gas flow when installing.<br /><br />Product Attributes: <br /><br />Color: Black, Silver, Green, Blue, Gold<br />Material: Metal and Glass<br />Length: 82 mm\/ 3.23 inch<br />Quantity: 1 Pcs<br /><br />Package Include:<br /><br />1 x  WYIN W00-02A One Way Metal CO2 Bubble Counter<br /> <br />Note:<br /><br />1.Due to the light and screen difference, the item's color may be slightly different from the pictures. Please understand. Make sure you don't mind before you bid.<br />2.Please allow 1-5mm differences due to manual measurement.