of the liquid ring vacuum pump receives water through water intake pipe 12 and distributes the water across manifold distribution tube 16 which feeds the water directly into pump 30 through make up water injection orifices or intakes 70 as seen in fig3 the flush mount manifold 10 is provided with caps 14 for direct access to the interior of manifold distribution tube 16 each cap 14 preferably is provided with threads 22 for engaging internally threaded cap receptacles in the manifold distribution tube 16 the orifices 21 of the manifold or the discharge pipes 20 can be inclined to mate and be in axial alignment with water injection inlets 70a 70b 70c or 70d as shown in fig5 whereby the axes of the opposing caps 14 will also be aligned with the axes of the mating orifices 70 21 or orifices 70 and pipes 20 and parallel with each other cap axis a nut type square head 26 is used to remove the cap the flush mount manifold 10 is affixed directly to the pump housing 34 by connecting flange 28 to the housing as with bolts overall the pump 30 is shown without the manifold distribution tube 16 in fig3 in operation a motor 40 drives a shaft 32 through a bearing housing 36 gas is injected into the pump through an inlet passageway 38 make up secondary plant water from a source 68 is fed into the pump through the manifold the manifold distributes the water through the wall of the pump housing 34 through the injection orifices 70 the manifold distribution tube 16 is attached to the pump.