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SIZE GL45: replacement cap secures contents of media bottles to help prevent spills and evaporation PP SCREW CAP: the blue screw cap can reduce the risk of liquid evaporation and exposure, made of polypropylene material, which is resistant to corrosion and high temperature, and the lid can be sterilized by high-pressure steam treatment at 140°C SILLICONE GASKET: with Silicone Gasket to provide a tight seal and a barrier against moisture and gas PP POUR RING: with Pour Ring SAFE, DURABLE & LEAKPROOF: Offering superior heat and chemical resistance, the glass bottle storage caps are linerless, one-piece polypropylene plug seal caps with drip free pouring rings.