These PYREX® aspirator bottles have a protective PVC coating for longer product life and safety. Protective coating helps prevent glass from shattering and reduces spills. Autoclavable at 121°C and resistant to thermal shock. Bottles feature a tubular sidearm outlet for attachment of flexible tubing. The tubulation is not coated to allow easy connection of standard size tubing. Covered by U.S. Patent# 4940613.