since eheim 1048 is 1/2, u can go from eheim to bix and use 1/2 there. from the bix u can start using the 3/8 for going to wb and from second rad back to pump. anyway, since i glued the eheim, it has no trouble doing 2 rads. try not to use too many 90° fittings. my temps have improved with +/- 6°C. so u need to know that temperature decrease is worth the trouble for you. if u can, u really need to go for those cuplex wb's. they have removable plexi tops with an o ring seal. u can easily clean em if they get clogged up. i consider that a big advantage against dd maze3 (don't think they have removable tops).
c ya
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