70 creates a sealed enclosure defining an interior volume 73 which contains cone stack 26 each cone 74 of cone stack 26 has a center opening 75 and a plurality of inlet holes disposed around the circumference of the cone adjacent the outer annular edge 77 typical cones for this application are illustrated and disclosed in u s pat nos 5 575 912 and 5 637 217 the typical flow path for rotor assembly 24 begins with the flow of liquid upwardly through the hollow center 78 of rotor hub 25 the flow through the interior of rotor hub 25 exits out through apertures 79 a flow distribution plate 80 is configured with vanes and used to distribute the existing flow out of hub 25 across the surface of top cone 74 a the manner in which the liquid lubricating oil flows across and through the individual cones 74 of cone stack 26 is a flow path and flow phenomenon which is well known in the art this flow path and the high rpm spinning rate of the cone stack assembly enables the small particles of soot which are carried by the oil to be centrifugally separated out of the oil and held in the centrifuge the focus of the present invention is on the design of base 21 which is configured with and defines fluid inlet 82 passageway 83 connected to the inlet and a fluid outlet that permits the fluid entering base 21 from flow nozzles 27 and 28.