These stoppers are lightweight yet very strong to reduce chipping and breakage, thus minimizing replacement costs.

• Meet ASTM E-675 specifications
• Flat top design allows stopper to stand on its head
• Fully interchangeable with other common stoppers
• Clear color
• Comes in packs of 6

The flat top design allows the stopper to stand on its head, which frees the user’s hand and minimizes potential contamination. They are fully interchangeable with other common flask stoppers and fit all standard labware of comparable size.