Specification Brand : PROGLASS BulletPoint1 : Be Made From G3.3 Borosilicate Glass BulletPoint2 : Annealing Point ------560℃ BulletPoint3 : Linear Coefficient of Expansion------ 33×10-7/℃ BulletPoint4 : Softening Point------820℃ Color : Clear ItemName : Proglass Three Way Glass Valve Adapter ItemTypeKeyword : lab-distillation-apparatus Manufacturer : PROGLASS Material : Glass NumberOfItems : 1 PartNumber : 708214096757 ProductDescription : Glass Stopcock with Spring Made of borosilicate glass Made by hand blowing Description: With 2mm Glass stopcock. Converts standard vessels to airlessapplications. If you need other size,feel free contact with us ProductSiteLaunchDate : 2017-09-02T07:00:00.000Z Size : 14/20 UnspscCode : 41000000