The Screw Cap for Reagent Bottle (GL45, Red, PBT) is a high-quality red screw cap built from tough PBT plastic to handle high heat and harsh chemicals without breaking down. They fit perfectly on any standard GL45 bottle from 100mL to 5L, making them a versatile choice for your lab. Each cap comes with a handy insert to create a tight, leak-proof seal that keeps your liquids safe and prevents evaporation. It is a simple, reliable solution for anyone who needs a secure lid that lasts through heavy daily use and sterilisation.