WE ARE MANUFACTURES OF HIGHEST QUALITY LABORATORY GLASSWARE &LAB EQUIPMENT.SPECIALLY IN ALL TYPE OF STOPCOCKS AS PTFE KEY,HIGH VACCUAM ROTAFLOW,MODULAR STOPCOCKS,GLASS KEY STOPCOCKS,BURETTES,REAGENTS BOTTLES,CONDENSERS ETC.WE MADE ALL GLASSWARE IN BOROSILICATE GLASS TUBE 3.3