These aspirator bottles have a protective PVC coating for longer product life and safety. Protective coating helps prevent glass from shattering and is autoclavable at 121°C and resistant to thermal shock. Bottles have a tubular sidearm outlet near the bottom for attachment of flexible plastic tubing and are very useful as a delivery/storage container for solutions. The tubulation is not coated to allow easy connection of standard size tubing. These bottles feature sturdy ring necks with a heavy duty rims and use rubber stoppers.