For the science folks out there - this Eisco Labs expansion adapter is one of those simple but essential lab tools that makes experiments run smoother. Made from heavy-duty borosilicate glass (the same stuff used in beakers and flasks), this adapter lets you connect lab equipment with different joint sizes - specifically 24/29 socket to 14/23 cone. At 3.5 inches long, it's compact but built to handle serious lab work. The borosilicate glass means it can withstand high temperatures and thermal shocks without cracking - we're talking strain point of 515°C, annealing at 565°C, softening at 820°C. It's also autoclavable and has superior chemical durability, so you don't have to worry about reactions with your experiments. Eisco manufactures their own products following strict quality standards, so you're getting professional-grade equipment that can handle tough laboratory environments. Perfect for home labs, school science classes, or professional research settings. Basically, when you need to make different pieces of glassware work together, this adapter bridges the gap reliably and safely. No more struggling with mismatched equipment - this simple tool expands your possibilities in the lab.