【Material】 - Made of boroslicate glass 3.3 tubing, durable construction, temperature resistance, with uniform wall thickness and low thermal expansion coefficient. 【Graduated Bottle】 - Clear scale for easy observation of experiments; High boron silicon thickened material, firmly welded. 【Note】 - when inserting the catheter into the rubber plug,rotate and screw it in after getting wet .Do not forcefully insert or connect it ! 【Wide Applation】 - Laboratory screw-top gas scrubber can remove impurities in the gas. Suitable for lab, chemical, biological analysis, environmental monitoring, industrial and scientific research. 【After Sales Service】 - Each part is individually wrapped and cased in Styrofoam to ensure that the goods will not easily damaged during transportation.If you have any questions about our products, please contact us.