The filter adapter cones are designed to fit into the neck of a vacuum flask, creating an airtight seal. This is crucial for maintaining vacuum pressure during filtration. The silicone funnel stopper is flexible and can accommodate different funnel sizes, making it a versatile tool for laboratory filtration. Features -Color:White -Material:Silicone -Size:8.30X8.30X3.20cm/3.26X3.26X1.26in -Size:7.10X7.10X3.20cm/2.79X2.79X1.26in -Size:6.00X6.00X3.20cm/2.36X2.36X1.26in -Size:5.00X5.00X3.20cm/1.97X1.97X1.26in -Size:4.20X4.20X2.70cm/1.65X1.65X1.06in -Size:3.40X3.40X2.30cm/1.34X1.34X0.90in -Size:2.80X2.80X1.60cm/1.10X1.10X0.63in -Size:2.20X2.20X1.40cm/0.86X0.86X0.55in -Size:1.70X1.70X1.20cm/0.67X0.67X0.47in -Nice filtration: utilizing funnel flask cones, this product provides filtration -Multifunctional: the funnel filtering adapter cones can be used in different scenarios, enhancing their utility -Sturdy construction: the funnel flask adapters are made with silicone materials, ensuring durability and reliability -User-friendly operation: the funnel filter adapter cones are easy to install, requiring minimal effort to set up and start filtering -Extensive compatibility: compatible with a wide range of laboratory equipment, making them highly versatile Package list: 10 x filter adapters