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Originally Posted by einsig
Why would the D4 balk at the smaller ID? Just curious.
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Most pumps dislike having a restriction at the inlet, and pH was just pointing out that having such a small inlet to the pump would more than likely hinder the ability of the pump to work to it's fullest potential (how much of a restriction I am unsure of).
By the looks of it, the AquaTube has replaceable barbs and you could swap in a 1/2" barb to go from the res to the pump, and leave everthing else at 3/8" tubing leaving the pump, through the rest of the system, then back into the res.
Good luck with your system.. be sure to post pics of it once you get it all together.
