fig4 coupling flange 82 is securely connected in a sealed manner to an end of the bearing housing 60 by conventional means such as plural nut and bolt combinations where only three such combinations are shown in the figures as elements 98 100 and 102 suction housing 56 further includes first and second side panels 72 a and 72 b and top and bottom panels where the top panel is shown as element 74 a suction housing 56 is generally rectangular in shape with each of the first and second side panels 72 a 72 b and top and bottom panels including a respective generally circular aperture therein thus as shown in fig2 and 3 the first side panel 72 a includes aperture 76 while as shown in fig4 top panel 74 a includes aperture 78 each of the aforementioned panel apertures allows for access to the inner portion of the suction housing 56 and the various components disposed therein to facilitate cleaning of the rotor stator pump 50 and or repairing or replacing pump components when needed each of the first and second side panels 72 a 72 b and top and bottom panels includes plural threaded pins therein for attaching a cover plate to the panel thus as shown in fig2 and 3 the first side panel 72 a includes four threaded mounting pins 80 a 80 d similarly as shown in fig4 the top panel 74 a includes four threaded mounting pins 79 a 79 d each of the aforementioned sets of threaded mounting pins on a respective panel allows a cover plate to be attached to the panel so as to cover the generally circular aperture in the panel and render.