Product Category Information:These neoprene rubber adapter sets consist of seven cones designed to fit the Buchner and fritted glass funnels, porcelain filters without headpieces, and for reverse flow cleaning of filter crucibles. Especially useful for supporting funnels, Gooch crucibles, filter tubes, etc. in filtration assemblies. The adapter does not need to be fitted closely around the funnel stem to be functional. Can be used singly or nested with adjacent sizes. Eliminates boring of special size holes in rubber stoppers and difficulties of insertion and removal. Withstands autoclaving. Available as a set or in individual sizes.