Plastic vacuum suction funnel

A vacuum suction filter comprising a generally cylindrical tube, a thrust ring mounted within said tube and tightly engaged therewith, a bottom wall mounted in one end of said tube and closing off said one end of the tube, a sieve plate support member seated on said bottom wall and extending therefrom to the level of said ring in said tube, and a perforated sieve plate seated on said thrust ring and said support member in spaced relation to said bottom wall to define a vacuum chamber in said tube, a first conduit connected in communication with said chamber through said tube adjacent said thrust ring for applying a vacuum to said chamber, and a second conduit connected in communication with said chamber through said tube and near said bottom wall to permit filtrate from said chamber, said bottom wall being inclined towards said second conduit;

• said tube, bottom wall, sieve plate and sieve plate support member all being formed of plastic materials.