Borosilicate glass filtration apparatus accomodates 47mm diameter membrane filters. The new design utilizes a nylon Ace-Thred adapter to join the glass funnel, filter flask and fritted disc together. This design eliminates the need for the clamping device, stopper and base piece. The unit is easy to assemble, dis-assemble and clean. The fritted disc can be easily replaced and other porosity discs used. The apparatus is easier to use and more economical than older designs. See 6979-15 flask for use with 3702-05 adapter.