Chemglass Hollow Pennyhead Glass Stopper 24/40 Lot of 4 Stoppers

The Chemglass CG-3000-05 is a high-quality hollow pennyhead stopper designed to provide a secure, ground-glass seal for laboratory glassware with a 24/40 standard taper joint. These are essential for sealing flasks, separation funnels, and other glass apparatus during storage or chemical reactions. Being hollow makes the stopper significantly lighter than solid glass versions, reducing the weight load on delicate glass joints and making them easier to handle. The 24/40 ground surface is manufactured to strict tolerances to ensure a leak-tight, vacuum-compatible seal when used with a small amount of joint grease or a PTFE sleeve. 

^{Used, in great condition.}