glass ground joints made of borosilicate 3.3 pyrex male and female clear, blue, green, yellow, ... amber, pink, purple lab use Ground glass joints of borosilicate 3.3 ... as well.Ground glass joints of borosilicate 3.3 pyrex are also commonly found on all ... for stoppers.Glass ground joints of borosilicate 3.3 pyrex types:Conically tapered jointsBall-and-socket ...