Possible Clues:

• Container for precipitation? There must be barrels around in area of course
• Chemistry lab item
• Laboratory container
• Laboratory experimental container
• Centrifuge insert
• Laboratory need
• Try a pipe in the lab?
• With the barrel set upside down, 'e might have it in the lab
• Underground river famous for trout? On the contrary, this is filled with chemicals
• Ling glass cylinder used in laboratories