- Hollow cup allows use for microanalytical work when inverted
- Unaffected by corrosive chemicals; unbreakable
- Need no lubricants
- Snug fit, easy removal
- Weight of top keeps hollow tip up (all stoppers are hollow except 14-645-35B, 14-645-20C and 14-645-20D), prevents contamination of wetted surface when placed on lab bench
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