may arise to dictate a preferably horizontal orientation horizontal alignment may be more suitable for location of the equipment inside a building or other above ground enclosure additionally in larger capacity systems the physical length of the pump chamber may be too long to assemble and mount in a vertical position accordingly fig6 illustrates a horizontal embodiment of the invention wherein two horizontal parallel pump chambers 10 mounted on a fabricated frame 37 above a floor plane 35 are connected in duplex with the suction 31 and discharge 43 piping plumbed together to common inlet and discharge pipes respectively in some respects this embodiment of the invention offers more convenient and effective maintenance access for example such an installation may be more appropriate for an internal basement housing above a basement floor grade where there is inadequate ceiling clearance to axially align the pumps 11 with the chamber tubes 10 in extension therefrom preparatory to telescope insertion but sufficient horizontal floor area is available in other respects the general layout of the invention remains the same in the horizontal position as in vertical alignment in that the chamber inlet coupling 12 may be in the side of the chamber 10 wall or the chamber end in either case the pump 11 discharge threads directly to the discharge pipe and the top cap flange 13 contains the discharge nipple 19 and the motor conduit compression seal couplings 21 the same.