Uxcell Silicone Rubber Tapered Plug 18mm to 25mm Solid Bungs Stopper with Ring for Test Tubes White

What is this? The Silicone Rubber Tapered Plug is great for laboratory utensils such as flasks test tubes or other laboratory applications also can as a sewer plug water pipe plug or drain plug with a Ring on the top for easy installation and removal a smooth surface and rust resistant ensures long time use. Are there any advantages of the product? Made of Silicone Rubber with good resistance to chemicals acid and alkali resistance can withstand high temperatures in a short time. How to use it? Conical design solid easy to install and good sealing performance flexible and durable not easy to crack shrink harden or break. What should I notice? Please check the size carefully before ordering!