MECCANIXITY Rubber Solid Plug Soft Flexible Stopper for 17-18mm Hole Black 5Pcs

What is this? Rubber Solid Plug is used to seal bottle flasks in the laboratory or seal holes tubes in the kitchen, home, etc, soft and flexible, easy to fit most holes. What will I get? The Rubber Solid Plug is in size of: Bottom Diameter: 17.8mm / 0.7 inch; Top Diameter: 22mm / 0.87 inch; Height: 18mm / 0.71 inch;In the package of: 5 x Rubber Solid Plug Are there any advantages of the product? Made of rubber, good resistance to chemicals, and can withstand high temperatures in a short time. T shape Solid plug, good sealing performance, flexible and durable, not easy to crack, shrink, harden or break. How to use it? Cap designed for easy installation and removal, no tools required. What should I notice? Please check the size carefully before ordering!