4" Stainless Steel Buchner Funnel4 Inch Stainless Steel Buchner Funnel 4 Buchner Funnel Kit: This buchner funnel kit adapts to any vessel with a 24 40 joint. The included adapter makes it possible to pull vacuum and use large vessels as a collection. Max internal volume of the buchner funnel is 0. 82L, but can be adapted with a larger spool for higher capacity. This kit features: 4 x 4 304SS spool with a capacity of 0. 82L 4 Tri Clamp Single Hinge Clamp 4x1. 5 304SS Hemispherical