Abstract: Disc filter assembly in which a plurality of filter discs are mounted on common shaft for rotation to selectively dispose disc surfaces under vacuum in a confined body of slurry through a portion of said rotation and to discharge formed cake from said surfaces by "blow" action through another portion of rotation. Each disc has plurality of sectors in sequential arrangement circumferentially of shaft mounted on a hollow center shaft and communicating with passage-defining means controlled by a valve at the end of the shaft. A connector having a curved passage establishes communication between a disc sector and the passage-defining means which it connects by externally applied welding.