Bel Art Scienceware® rugged polypropylene carboys with a molded-in bung to accept the polypropylene spigot (included) that can be operated with one hand. Carboys have two large handles for transport or pouring. The 83mm polypropylene buttress screw cap has a built in silicone gasket for positive seal. Feature excellent chemical resistance and are ideal for storing sterile solutions or sterile water. Carboys are also available without spigot. Steam autoclavable at 121°C. When autoclaving, do not engage cap threads.