the top line from the res goes to the top line on the pump.
bottom line from the res goes to the second from the top on the pump.
I had it backwards when I first hooked it up and there was almost no flow. and a lot of noise.
the instructions are a bit misleading Look at fig(s) 9 and 10 on pg 26 of the manual.
I figure it uses the top line to let the air escape. With the res it stays pretty full and there is no cavitation on the pump. it's then only noisy for a few seconds when coming on.
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