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 rubb