Patent ID: 7681585

Claim:
An arrangement for storing and conveying a liquid comprising: a first liquid container having an inlet opening and an outlet opening; a pipe stub as a first drain stub communicating with and extending from said outlet opening of said liquid container, and terminating with a drain stub flange at a free end of said first drain stub; a circular flange having plural connection openings therein, and plural pipe stubs as connection stubs respectively communicating with and extending from said plural connection openings and terminating with respective connection stub flanges at free ends of said connection stubs; and a drain line connected to said circular flange and communicating with all of said connection stubs through said connection openings; wherein said drain stub flange of said first drain stub is mechanically coupled directly to said connection stub flange of a first one of said connection stubs so as to communicate said first drain stub through said first connection stub to said drain line.