These PYREX® general purpose batch distillation apparatus allow the addition of reagents via the No. 27 Standard Taper PYREX® stoppered neck. It is ideally suited for the batch production of high purity distilled water. The flask has a flat bottom with a side delivery tube, terminating in a 19/38 Standard Taper joint. Graham condenser tubulations are 10mm O.D. For replacement stoppers, see No. 7650. For replacement condensers, see No. 2540-200.