Abstract: A curd preparation vat provided with a sealing construction for a shaft passing through a wall of the vat, which sealing construction has at least one receiving space and a sealing ring included therein in operation, surrounding the shaft, wherein the sealing ring has an annular body which is provided with a sealing lip which cooperates with a radially extending surface of the sealing construction, and wherein the annular body furthermore has an axially inner surface abutting against first positioning means of the sealing construction, wherein the sealing lip of the at least one sealing ring extends both radially and axially obliquely outwards from a both radially and axially outer edge area of the annular body, and wherein between the sealing lip and the inner surface of the annular body that abuts against the shaft, an axially outer surface of the annular body is situated, which cooperates directly with second positioning means, which leave the lip clear, for fixing the at least one sealing ring between the