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is the feed dual hoses or is it T'd into two hoses to go into the back of the rail? kinda like this below... red is the feed, blue is the return...the black squares happen to be the rails. 
if not...can you make a picture of how your hoses are? i want to do the same to my border eventually, but right now my feed comes in one side, and return out the other. so its just one big circle of sorts.
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