Our premium Soft Rubber Stoppers (size 4) with 2-holes are ideal for a variety of laboratory and DIY applications. Specifically designed to fit 100 mL and 125 mL Erlenmeyer flasks and 100 mL flat-bottom flasks, these size 4 stoppers are crafted from high-quality, non-greasy rubber with a durometer of 45, ensuring a snug fit and exceptional durability. Each stopper features two holes, making them perfect for applications requiring multiple insertions or venting options.
 
Features
 
High-Quality Material: Soft, non-greasy rubber for reliable sealing.
Fits Perfectly: Designed for 100 mL and 125 mL Erlenmeyer flasks and 100 mL flat-bottom flasks.
Precise Dimensions: Top diameter of 26mm, height of 25mm, bottom diameter of 20mm.
2-Hole Design: Ideal for applications requiring multiple insertions or venting.
Convenient Pack: Approximately 38 stoppers per 1-pound pack.
Durable: Durometer of 45 for optimal firmness and flexibility.