Filter Adapters are made from neoprene and are tapered, collar-type holders. They are designed to fit between a filtering funnel and flask. Use with buchner funnels, grooch crucibles, filter tubes, etc. Use individually or nesting with adjacent sizes. Eliminates boring of rubber stoppers and the difficulties of inserting and removing glass stems in stoppers. Autoclavable.
Filter Aids are a molded rubber disc designed to support and seal a filter crucible or a funnel in the neck of a filter flask. The bottom of the disc is flat to create a tight seal against the lip of a flask.

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