Level control for surface treatment baths

A level control device for pickling, degreasing, nickel-plating and similar process apparatus having at least two baths of different specific weight in which the bath level of the bath with the higher specific weight is below the bath level of the bath with the lower specific weight, comprising pipe means for connecting the two baths having a first vertical portion positioned in the bath with the lower specific weight and having an upper inlet end positioned directly below the bath level of the bath with the lower specific weight, a second horizontal portion forming an angle of 90.degree. with the first portion and being connected at one end to the lower end of the first portion, and a third portion positioned in the bath with the higher specific weight and forming an angle of 90.degree. with the second portion, said third portion having an outlet end positioned below the inlet end of the first portion and means for adjusting the height of the outlet end of the third portion of said pipe means in the bath with the higher specific weight without movement of said first and second portion so that flow occurs from the bath of lower specific weight to the bath of higher specific weight through said pipe means.