Smooth Rubber Stopper Filter Cone Funnel Filtration Adapter Chemistry Filter Buchner Funnel Flask Cones Collar Rubber Description _x000D_ _x000D_ Made of premium rubber with good elasticity, smooth surface and hard wearing. Used for filtration assemblies, together with a flask for filtration. They can be used singly or nested with adjacent sizes. Nine different diameters, various sizes to meet your needs. _x000D_ _x000D_ Features _x000D_ _x000D_ - Color: Green. _x000D_ - Material: Rubber. _x000D_ - Size: 8.40X8.40X3.20cm/3.30X3.30X1.26 inch. _x000D_ - These adapter cones are designed to fit around the stem of Buchner funnels, porcelain filters, and fritted glass funnels. _x000D_ - Great useful in the reverse flow cleaning of filter crucibles. _x000D_ - Perfect for supporting funnels, gooch crucibles, filter tubes and other apparatus that are routinely used in filtration assemblies. _x000D_ - Fully functional even if they are not tightly fitted around the stem of the funnel being used. _x000D_ - They are also an excellent alternative to boring special sized holes in rubber stoppers, or using the more unstable rubber filter aid. 9 x stoppers _x000D_ _x000D_