The material compactor (10) generally includes a feed apparatus (12), a preliminary compaction apparatus (14), and a final compaction apparatus (16). The final compaction apparatus generally includes a compaction chamber (52) having an adjustably taperable choke tube (34). The area of the inner cavity (53) of the final compaction chamber can be tapered to become measurably smaller or larger at the discharge or expelling end. Consequently, compacting movement of the material within the compaction chamber and through the tapered choke tube significantly subjects the material to restrictive compacting pressure which in turn compacts the material and performs liquid separation with each operationally continuous movement through the final compaction apparatus.