Patent ID: 7100640

Claim:
An arrangement for storing and conveying a liquid comprising: a first liquid container having an inlet opening and an outlet opening; a pipe-shaped first drain stub connected to said outlet opening of said liquid container; a first partial flange connected to an outlet end of said drain stub; at least one complementary flange adjoining and complementing said partial flange so that said complementary and partial flanges together form a first circular flange; a second circular flange connected to said first circular flange; a drain line connected to said second circular flange, so as to establish liquid communication from said outlet opening of said first liquid container, through said first drain stub, said first partial flange, and said second circular flange into said drain line; and at least one additional liquid container arranged adjacent to said first liquid container about a fictitious upright axis extending vertically through a circle centerpoint of said first circular flange, wherein an outer diameter of said first circular flange is large enough so that said first circular flange extends radially outwardly from said upright axis to project under each one of said first liquid container and said at least one additional liquid container.