a rectangular opening where the working fluid is admitted into the turbine housing the salient features of these transition sections eliminate loss inducing features such re entrant angles and sharp edges the progression of transitions described above eliminates said loss inducing features by interposing concave or convex features between any planar surface within the inlet passage most important the shapes and sequence of the transition sections join all internal edges of planar surfaces to concave or convex surfaces at tangency which eliminates aforementioned loss inducing edges and abrupt changes in fluid direction fig6 shows an oblique view of the inlet body with at least one strengthening rib 8 visible the upstream portion of the inlet body 18 affords an internal surface 10 and an external surface 11 into which standardized mating surfaces such as pipe threads or bores for compression fittings are machined it is understood that any number of strengthening 8 ribs may originate from the periphery of the inlet body 18 extending to the flange 6 including the number zero in the case of an especially short inlet and sufficiently thick and sufficiently strong material fig7 shows an alternative embodiment in which the attachment affordance is a flange fitting 12 of a known industrial standard such as an ansi standard pipe flange in this embodiment at least one strengthening rib 8 may extend to bolster the flange fitting 12 as well one may now examine the features which properly and precisely locate the inlet body into a receiving.