The system includes a reservoir (12) which communicates with the oil pan such that the oil level in the reservoir corresponds to that in the oil pan.

Each core plate mates with a respective tank to define a sealed chamber.

The inner tank dome (32) is provided with an inner tank manhole (30), and the outer tank dome (42) is provided with an outer tank manhole (40) in a location that corresponds to the inner tank manhole (30).

A characteristic difference indicates a high resistive layer, which corresponds to a hydrocarbon reservoir.

The width-height ratio of the water container is greater than 2.5:1.

The width-height ratio of the housing substantially matches that of the water container.

The system includes a reservoir (12) which communicates with the oil pan such that the oil level in the reservoir corresponds to that in the oil pan.

At least one of the variety of media corresponds to the theme identifier device of the soap container.

The gas spring includes an air reservoir, the effective volume of which is preferably adapted to be tuned, at least approximately, to the mass being damped.

The housing may also include a surface configured to substantially mate with a surface of a vehicle, such as a fuel tank surface.

The reservoir assembly includes a reservoir and a reservoir tube; and the rotor assembly includes a drive gear and at least one compression element.

A passage in the reservoir can have a nonuniform taper that corresponds to the outer surface of a water filtration cartridge (20).

When the required quantity of treatment fluid is low and the flow conditions in the container (12) are optimal, the form of the container bottom (1) corresponds to the form of the substrate (2) to be treated.

The reservoir can be a micro-reservoir.

A fuel tank (10) comprises a main tank (12) and a sub-tank (14).