General-purpose bottles feature white enamel graduations and marking spots. Wide, 30 mm int. Ø openings are designed for easy filling. Replaceable, drip-free, clear polypropylene pour ring is incorporated into the bottle design. Bottles are supplied with linerless GL 45 polypropylene caps that are autoclavable to 140 °C (284 °F). Optional high-temperature caps and pour rings are autoclavable to 180 °C (356 °F).