Heavy-duty graduated polypropylene (PP) carboys feature octagonal shape for increased rigidity when full. The neck is offset for easier filling and pouring. Molded handle is sealed at the ends to prevent contamination. Durable, leakproof spigot is supplied with a tube fitting to accept 0.31" (8-mm) ID tubing. Carboys include a PP screw closure. Autoclavable up to 275°F.