The 5pcs Silicone Laboratory Chemistry Rubber Seal Flask Tapered Plugs Stoppers are designed with a tapered shape and standard dimensions, making them easy to insert or remove. They create an airtight seal in the mouth of your carboy or fermenter, supporting effective fermentation setups. These stoppers are suitable for laboratory, household, and industrial applications. Made from durable rubber, these stoppers are long-lasting and reusable. The smooth, tapered design ensures a reliable seal and a secure fit across a variety of container openings. Available in multiple sizes to help minimize oxygen exposure during the fermentation process. The Silicone Laboratory Chemistry Rubber Seal Flask Tapered Plugs Stoppers are soft, easy to handle, and provide a consistent seal. The package includes 5 stopper plugs in different sizes. Please note that colors may vary slightly from the images due to lighting and screen settings. Minor dimensional variations may occur due to manual measurement. Key Features: - Tapered shape with standard dimensions for easy use - Creates an airtight seal in carboys or fermenters - Made from durable rubber material - Smooth and tapered sides for a secure fit - Helps reduce oxygen exposure during fermentation - Soft and reusable design - Includes 5 stopper plugs in assorted sizes - Suitable for laboratory, household, and industrial use