This is an excellent aquarium u shaped tube. Made of glass， it is transparent and can be connected to CO2 diffuser. It&#39;s really a great accessory you should buy for your CO2 generating work.<br /><br />Features:<br />Made of high-quality glass， transparent to use.<br />Special U shape design， fit fish tank well.<br />A perfect accessory for DIY CO2 diffuser.<br />Easy to connect with soft tubes.<br /><br />Specifications:<br />Color: Transparent<br />Material: Glass<br />Suitable Tube Diameter: Approx. 5mm<br />Item Size: 4.5 * 2.7cm / 1.77 * 1.06in<br />Item Weight: 3g / 0.11oz<br />Package Size: 8 * 6.5 * 0.5cm / 3.15 * 2.56 * 0.196in<br />Package Weight: 7g / 0.25oz<br /><br />Package List:<br />1 * U Shaped Tube<br><img src="//img.tomtop.com/product/xy/2000/2000/p/gu1/H/0/H16570/H16570-1-e4f4-R9P5.jpg" /><br>$$<img src="//img.tomtop.com/product/xy/2000/2000/p/gu1/H/0/H16570/H16570-1-e4f4-Q8zR.jpg" /><br>$$<img src="//img.tomtop.com/product/xy/2000/2000/p/gu1/H/0/H16570/H16570-1-e4f4-x8Hg.jpg" /><br>$$<img src="//img.tomtop.com/product/xy/2000/2000/p/gu1/H/0/H16570/H16570-1-e4f4-AGZk.jpg" /><br>$$<img src="//img.tomtop.com/product/xy/2000/2000/p/gu1/H/0/H16570/H16570-1-e4f4-9hAv.jpg" /><br>$$<img src="//img.tomtop.com/product/xy/2000/2000/p/gu1/H/0/H16570/H16570-1-e4f4-ZoXP.jpg" /><br>$$<img src="//img.tomtop.com/product/xy/2000/2000/p/gu1/H/0/H16570/H16570-1-e4f4-vczG.jpg" /><br>