The Y type 3 way connecting adapter is used to assemble three vessels. With two 24/40 outer taper joints on Top,and an 24/40 inner joint at bottom. Laboy Glass connecting adapter is made of high quality borosilicate glass 3.3 having very low coefficients of thermal expansion for resistance to heat, and a very high resistance to chemical attack.Annealed at 800 degree Celsius ,can be heated directly in an open flame and can withstand typical laboratory thermal variations in Chemistry processes like heating and cooling.