Science teachers and lab enthusiasts, these Eisco neoprene stoppers are exactly what you need for your experiments and demonstrations. You get a pack of 10 blue stoppers, each with two 5mm holes perfect for inserting tubing or thermometers. The measurements are precise - 27mm at the bottom, 34mm at the top, and 25mm in length - making them ideal for standard laboratory glassware. What's great about neoprene is its durability and resistance to oils, acids, and bases, so these stoppers hold up well to various chemicals. They can handle temperatures up to 250°F (120°C), which covers most common lab applications. I've used these in chemistry classes for distillation setups and gas collection, and they create a reliable seal every time. The blue color makes them easy to identify among your lab supplies, and the quality is consistently good across all 10 stoppers. Whether you're setting up student labs, conducting research, or just need reliable stoppers for various projects, this pack delivers quality and value. They're one of those basic lab supplies that you'll find yourself reaching for again and again because they just work reliably. Stock up now and you'll be prepared for any experiment that comes your way!
Free 30-day returns 
Free 30-day returns
