I'm not 100% positive on this but I think you will get a slight pinching effect, but, I think you actually want this because of the multiple outlets. You want the manifold line to be slightly pressurized so that each nozzle outputs more or less the same flow as any other. Otherwise, water will just mostly go out the first nozzle and the further away each nozzle will have less and less flow.
Overall the multiple outlets will compensate for each individual outlet having a slight reduction, so it's not like you're not getting the most bang for the buck on the pump.
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-- Tony
My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee!
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