ETFE Pouring Ring (Red), for Laboratory Bottles, Autoclavable upto 18°C, Hot-air. PP Tamper proof Screw Cap (Blue),for Laboratory Bottles,With DIN Thread,Autoclavable upto 140°C, Steam, DURAN. PBT Screw Cap, with Aperture (Red) for Laboratory Bottles, Autoclavable upto 200°C, Hot-air, DURAN.