Here is a problem I discovered and have not seen on the forums yet - perhaps I missed it.
I have my TIII installed on its side and am using one of the two rear ports as an inlet. The channels on either side of the ports are too close to allow the use of a compression fitting. It took some very careful work with my trusty Dremel to widen the opening.
I suppose a standard barb would fit but that is not the way I am wired.
BoxGods, perhaps this is a future mod?