The inlet and outlet of this pump weren't labeled at all and I didn't see anything in the reference material to suggest what was what. I was able to tell this quickly by filling it with water and plugging it in for a second to see where the water was flowing. The entrance is at the end opposite the engine (horizontal), the exit is at the top (vertical), for those interested. This is a good pump so far and is significantly quieter than the small 12 volt pump we used previously. Looks solid, doesn't get very hot when in use. They accidentally sent a 1.6 hp pump. (I ordered a 1 HP pump). It draws 1200w instead of the 800w that 1hp would use, but given the size of my garden it's probably a good thing they sent a bigger pump. (I think the price difference is only about $2). The price was also very good considering it is such a well made device.
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