Duran-laboratory-bottles - Sigma-Aldrich. DWK218016316: clear bottle, graduated, neck Joints: threaded (GL45), with screw cap to drain contents, WITH HIGH TEMPERATURE RED PBT SCREW-CAP AND ETFE POURING RING, capacity 2000 mL . Bottles, Square Wide Mouth HDPE, 2000mL, pack/5. Description. Bottles, Square Wide Mouth HDPE, 2000mL.