The complete PYREX® Kuderna-Danish concentrator apparatus consists of a 3-ball Snyder column with 24/40 joints, a flask with a 24/40 outer upper joint and 19/22 inner lower joint, and a graduated tube with 19/22 outer joint. If further concentration is desired, select a 2-ball column (2158-2CO) and combine with the Kuderna-Danish tube of your choice.

• The 250 and 500 ml complete apparatus include a 10 ml tube
• The 1000 ml complete apparatus includes a 25 ml tube
• Apparatus is held together using glass hooks and 1" stainless steel springs
• Standard taper botton joint: 19/22
• Standard taper top joint: 24/40

Tubes are graduated from 0 to 2 ml in 0.1 ml intervals and from 3 ml to capacity in 1.0 ml intervals. If further concentration is desired, select a 2-ball column and combine with one of the tubes. The apparatus is held together using glass hooks and two 31.8 mm (1¹/₄") stainless steel springs.