A diptank applies coating solution to devices that are dipped therein. A reservoir
tank contains a reservoir of coating solution. The diptank forms a coating solution
overflow return that flows to the reservoir by means of a conduit and a self-adjusting
return line. The self-adjusting return line comprises a plastic tubing with an
upper portion, a central portion and a lower portion. The upper portion is coupled
to the conduit. The tubing central portion is flexible and corrugated and arranged
to extend and compress in its length. The lower portion is supported by an attached
buoy that floats on the surface of the reservoir. The lower portion defines an
outlet that discharges the coating solution overflow return to the reservoir. As
a result, the coating solution overflow return is discharged to the reservoir at
a fixed vertical distance or level with respect to the surface of the reservoir.
