It is a long, slender tube at one end and the other end has a rubber. Used for sucking water 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. Vacuum tube used for chemical substance into another test with the packaging. 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 test substances in the container is to be used in other substances, see chemical reaction of the agent.