Engineering principles dictate the shape. Eccentric, having the axis away from the center, reducers are used under suctions, meaning before the pump. Concentric shares the same center, reducers are used under vacuum, meaning after the pump. These reduce in size to match the size of the incoming pipe connecting to the pump suction flange and the pipe size connecting to the pump discharge flange.
Mer-Made’s fiberglass reducers are much more heavy duty than molded PVC reducers and utilize integral flanges which resist cracking if slightly over tightened.
Drilling pattern under specifications needs to be downloadable and does not need to be under specifications (see general comments)
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