Hello there, I just setup my first perry pump. I agree the printed material is a bit vague...you did find the instruction set on their site?-its a PDF (includes sketches of tubing and mount scenarios) of what they include with the pump.....hex nut for adjustment-left(out) to decrease pump effect, right(in) to increase flow...seems counter intuitive but there it is. Mindful also in mounting that the little hole in the plastic end is facing down. good luck