Corning Pyrex Borosilicate Glass Replacement Adapter Tube, 29/42 Bottom - 19/38 Top Standard Taper Joint
This PYREX adapter tube is a replacement for the Kjeldahl Nitrogen Distilling Apparatus (No. 3340-500) used for determining nitrogen in organic compounds. The tube has an inner 29/42 Standard Taper joint on the flask end and an inner 19/38 Standard Taper joint on the Graham condenser end. For replacement Graham condensers, see No. 2540-200.