The Kontes (Kimble) 2L chromatography column has a 24/40 ground glass connection at the top and a filtration disc at the bottom. It comes with a size 4 Teflon stopcock.The effective length of the column is approximately 18 inches x 3-inch outer diameter (O.D.); the overall length is approximately 32 inches.Condition: Previously-owned, used, very good. The filtration disc needs to be soaked in solvents. Sold as is without warranty expressed or implied. Buyer is responsible for determining the suitability of this product for their application.