Check the listing for details. Stopper - Flat Head, Solid Cone, Borosilicate Glass, Size 19/26 - Eisco Labs. Condition: New. Listed at 9.99 USD. Stopper - Flat Head, Solid Cone, Borosilicate Glass, Size 19/26 - Eisco Labs Solid Cone StopperPenny HeadSize 19/26 jointMade of high quality borosilicate glass Solid cone stopper with penny head. Joint size 19/26. Made of high quality borosilicate glass. 2.25" tall. Autoclavable, with superior chemical durability. Low temperature gradient- can withstand high temperatures & thermal shocks. Eisco Labs Borosilicate glass has the following heat tolerances: Strain Point -515°C | Annealing Point 565°C | Softening Point 820°C. Eisco Labs proudly manufactures its own products using state-of-the-art equipment, and following the highest standards of quality control. Each product is carefully designed by a team of laboratory professionals and experienced engineers with quality and durability in mind. They are manufactured with only the highest grade, raw materials and according to international quality standards to ensure that they can withstand use in even the toughest laboratory environments. Product Details Brand Eisco Product Type Glass Stoppers MPN CH0870C Check out my other items.