Rubber Cone Int. 27/18 Ext 32/24Mm For Flask Neck 25/27

For use with Buchner Funnels as an alternative to boring a large hole in a rubber bung. The seal between the Buchner funnel and flask forms around the tapered base of the funnel and not the stem. It is therefore necessary to select a cone that fits the neck of the flask and not the funnel stem. Int. 27/18 Ext. 32/24mm for Flask Neck 25/27. Priced in single units.