i used 3 inch pipe with 90 elbows ,its not free flowing ,help figure whats wrong.
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I had to add a 2" extender to stop them from flicking the feed out.Have you looked at these http://www.homedepot.com/p/3-in-ABS-DWV-Hub-x-Hub-x-Hub-Wye-C5810HD3/100342323
You would just need to cap the bottom.