stonylab Glass Hollow Stopper, 5 Pack Borosilicate Penny Head Stopper with Closed Bottom for 24/40 Outer Joint

Secure Sealing: designed to tightly seal laboratory equipment, effectively preventing any leaks of liquids or gases Hollow Glass Penny Head Stopper: 5-pack set; designed for 24/40 outer joint glassware Premium Material: made of borosilicate glass, providing exceptional clarity, thermal and chemical resilience, and long-lasting durability Multiple Specifications: available in various size options to accommodate different diameters and depths of laboratory apparatus Warranty: StonyLab 1-year limited warranty; should any item arrive damaged, contact us immediately for prompt resolution