Specification Brand : Northern Brewer BulletPoint : <p>Breathable foam stoppers will withstand boiling or autoclaving temperatures, making them ideal for use in preparing a yeast starter. Fits 500 or 1000 ml flasks. </p> BulletPoint1 : The rubber stopper adopt a tapered shape design, easy to plug and pull, can be used to seal or block openings in containers to prevent the leakage of liquids or gases. BulletPoint2 : These lab tube plugs are made of high-quality rubber, non-porous, good elasticity, moderate hardness, not easy to deform, can be used for a long time. BulletPoint3 : 8 different sizes: 000#, 00#, 1#, 2#, 3#, 4#, 5#, 7#. Note: Please confirm the size before purchasing. BulletPoint4 : Rubber bungs can be used for different types of containers, such as laboratory test tubes, bottle tops, glass containers, etc. BulletPoint5 : Packaging: 16pcs white solid rubber stoppers. Color : White ExternallyAssignedProductIdentifier : 6976403642090 ExternallyAssignedProductIdentifier1 : 0840371318126 ExternallyAssignedProductIdentifier2 : 840371318126 IsExpirationDatedProduct : 1 ItemName : Foam Stopper 35-45Mm ItemPackageDimensions_Height : 16.891 centimeters ItemPackageDimensions_Length : 4.699 centimeters ItemPackageDimensions_Width : 13.3096 centimeters ItemPackageQuantity : 1 ItemTypeKeyword : science-lab-rubber-stoppers Manufacturer : NorthernBrewer Material : Rubber ModelName : Y-ZS-11-C05 ModelNumber : Y-ZS-11-C05 NumberOfBoxes : 1 NumberOfItems : 6 PartNumber : Y-ZS-11-C05 ProductDescription : Breathable foam stoppers will withstand boiling or autoclaving temperatures, making them ideal for use in preparing a yeast starter. The honeycomb structure of the foam stoppers will act is a filter for any airborne bacteria or wild yeast that might enter the flask. That's important because a lot of air is sucked into the flask while it is cooling. You can also leave the stoppers on the flask instead of a fermentation lock. Some people use foam stoppers to replace fermentation locks in their carboys, too.The small foam stoppers are 35-45mm wide and fit our 500 or 1000 ml borosilicate glass flasks, or a glass carboy. ProductSiteLaunchDate : 2012-06-08T12:30:47.000Z Size : 35-45Mm SupplierDeclaredDgHzRegulation : not_applicable UnitCount : 1