Quote:
Originally posted by tbittner
Looks like a great idea! But how would you keep the inside pipe from laying on the bottom of the outside pipe? I guess the end could have an adapter on it that would also fit inside the bigger pipe which would keep it elevated.
I'm not trying to tear your idea apart, I'm really curious about it. 
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You could make some small stand offs out of the removed material and cement them in a few places along the internal pipe. Or a coupler at each end.
You could actually use just half a pipe for the internal one. The whole point is to reduce drop, right? And at the same time not restrict flow.