?Exquisitely molded from solid PC as crystal as the glass£¬ our X1 4-in-1 Multi-functional U-shaped Air Intake Carbon Dioxide CO2 Diffuser (Check Valve/Bubble Counter) brings nice look and is uneasy to break. It is highlighted by the special U-shaped air intake which needs no bending£¬ check valve with stable performance£¬ bubble counter to bring high counting precision and ultramicropore atomization that helps produce delicate bubbles. With our CO2 diffuser£¬ you can effectively build up a more considerate CO2 system. No more waiting!                                    Features             Solid PC as crystal as the glass£¬ nice-looking and uneasy to break<br> U-shaped air intake£¬ no bending needed<br> Check valve with stable performance<br> Bubble counter to bring high counting precision£¬ easy to read<br> Ultramicropore atomization£¬ help produce delicate bubbles <br>                                                            Specifications             Material     Glass    <br> Color     Transparent    <br> Dimensions     (1.57 x 1.57 x 1.06)" / (4 x 4 x 2.7)cm (L x W x H)    <br> Weight     0.78oz / 22g     <br>                                                             Package Includes            1 x Multi-functional Carbon Dioxide Diffuser<br>