glass ground joints of male and female type borosilicate 3.3 Pyrex glass clear, ... , pink, purple, red Ground glass joints of male and female, made of borosilicate 3.3 Pyrex glass,are used ... commonly available parts. For example, a , , and with ground glass joints may be rapidly fitted together ... are hollow on the inside and open at the ends, except for stoppers. male and female glass ground joints