This molded rubber filter disc is designed to support and seal in place a filter crucible or a funnel in the neck of a filter flask. Inside diameter of the socket at top is 32mm, and outside diameter of the disc is 76mm. The bottom of disc is flat so that it seals tightly against lib of the flask.
This is 10 grams of Agar Powder. Agar is a growth medium used to culture microorganisms in laboratory situations.
