any suitable fasteners or fastening mechanism may be used to secure first connector 14 to the first vertical tank 12 and second connector 18 to the second vertical tank 22 for example first vertical tank 12 may include a receiving attachment for receiving first connector 14 the receiving attachment includes an opening therethrough which can be aligned with an opening in first connector 14 a pin 30 is inserted through the openings thereby securing first connector 14 in place in this embodiment of the invention second vertical tank 22 includes a second receiving attachment which functions in the same manner as the receiving attachment it is contemplated that any suitable fastening or connecting mechanism may be used receiving attachments may also be pivotable or may allow a pivotable connection of first connector 14 and second connector 18 for example the connection between the receiving attachments and first and second connectors 14 and 18 may be of a ball and socket variety with a pin or other fastener used to lock the connector in place when disposed at the desired angle alternatively the receiving attachments or connectors 14 and 18 may be movable between discrete positions extending at a variety of angles from the associated vertical tank a variety of mechanisms for providing pivotable and positionable connections are known in the art and it is contemplated that any such suitable mechanism may be used in conjunction with the present invention as shown in fig3 some embodiments of a connector 38 for use in a collective vertical tank of the present invention include a male connecting end 40 at one end.