I'm a little late to this party, but thought I would chime in.

We developed our X-Link system a couple of years ago to handle pumping water from one side to the other. Cuts fill and drain times roughly in half for most system. You can read more about it on our site here: http://www.wakemakers.com/x-link-cro...kage-html.html

As far as bags go, we list all of the X-Link compatible bags on our website, and there are plenty of off-the-shelf options that will work, so you don't have to spend the money for a custom bag, or risk cutting into your own bags to add extra ports.