Uxcell 40.5mm to 49mm w Hole Rubber Tapered Plug for Lab Home White 5 Pack

What is this? The 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. Are there any advantages of the product? Made of silicone rubber good resistance to chemicals can withstand high temperatures in a short time. There is a hole in the center of the plug for inserting a glass tube very convenient for meeting your needs. 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!