It is a long, slender tube at one end and the other end has a rubber. For draining water to drip into a test tube filled with other substances. In order to see the reaction of the reagent.
The glass tube is a long taper one end and the other side with rubber. Used for absorbing nutrients into the test tube to drip into other substances are contained. In order to see the reactions of chemical reagent.
There is a glass tube on the end of the slender and long on the other one is used for rubber suction tubes to drip into the test substances are to be used in the other reaction to the chemical agents.