vertical and generally horizontal respectively so that the water discharge is directed generally horizontally however a person skilled in the art will readily appreciate that if for design reasons the axis of the impeller shaft deviates from true horizontal the steering nozzle can be designed to compensate for that by fabricating the water passage of the steering nozzle such that its centerline deviates from perpendicularity with the pivot axis and deviates from parallelism with the impeller shaft axis by the same angle of deviation in that case the centerline axis of the steering nozzle will be horizontal even though the impeller shaft axis is not ensuring that the water is discharged in a horizontal direction the separate components shown in fig2 are assembled into the pump unit generally designated with the numeral 100 in fig3 the assembled pump unit 100 is in turn attached to the exhaust housing 16 by fasteners not shown the exhaust housing 16 has a vertical passage for the vertical drive shaft 64 the top of which penetrates an opening 114 in the top face of the exhaust housing to attach the assembled pump unit 100 to the exhaust housing 16 vertical drive shaft 64 must be aligned with the opening 114 and then lowered onto the pump unit until the bottom face of the exhaust housing sits on top of the top face of the inlet gear housing 18 as seen in fig3 the top face of the inlet gear housing has four threaded bores 102 which align with corresponding bores 104 in opposing recessed side flanges 106 of the exhaust housing 16 a pair of recesses 108 formed near the bottom on opposing sides of the exhaust housing only one of which is visible.