Size No. 5- Black Rubber Stopper - Solid, 1-Hole, & 2- Hole

Laboratory Grade Rubber Stoppers

Black rubber Stoppers with low sulfur content. Rubber stoppers are used to close test tubes and lab glassware, such as Erlenmeyer Flasks, Florence (Boiling) Flasks, and Filtering Flasks, to prevent liquid from escaping.  

Specifications:

• Size: 5
  
• Structure: Solid, 1-Hole or 2-Hole options
  
• Hole Size: 5mm 
  
• Top Diameter: 27mm
  
• Bottom Diameter: 23mm
  
• Fits Flask size: 125mL Flasks