chamber 208 interior to the integrated stator barrel 110 as detailed the interior chamber 208 is adapted to receive a supply of mobile phase or other liquid and provides operation in connection with the plunger 206 by having an inner diameter sized to the plunger an outer diameter sized to fit within the pump section and a wall thickness therebetween to provide sufficient strength the plunger 206 which has a substantially uniform cross section is slidably disposed within the interior chamber 208 and is sized to ensure effective operation during the load position 202 and the injection position 302 referring to fig2 to permit operation of the first pump 118 and the second pump 120 with a common integrated barrel stator 110 rather than providing a single pump along the centerline 2702 of the integrated barrel stator 110 the first pump 118 and the second pump 120 are mounted equivalently near the centerline 2702 of the integrated barrel stator 110 opposite the face i e the outer surface of the stator 210 so that the elongate pump barrel 116 of the first pump 118 and the elongate pump barrel 116 b of the second pump 120 are angled toward to the centerline 2702 to intersect the centerline 2702 just beyond the face of the stator 210 thus providing a first stator orifice 2704 and a second stator orifice 2706 on the face of the stator 210 alternatively the first pump 118 and the second pump 120 need not be mounted equivalently near the centerline 2702 of the integrated.