The screw thread opening has an I.D. of approximately 30mm. The supplied GL 45 cap is liner-less and both the cap and drip free ring are polypropylene and autoclavable to 140°C. GL45 square bottles 2000ml duran-HPLC Vials Supplier. Kimax Glass 2000mL Graduated Media Bottle & GL45 Screw Cap, 14395 $ 35.00.