I had to do work with mine though to get it to work with the DDC 3.2 pumps as it was designed for the older orange impellor DDC's (i think they've updated the design now though)
hope that helps a little!
Hey buddy, I've just bought two of these 3.2 pumps with the hardwareluxx attachment, what did it take to get it to work? At the moment I've just connected them in series using the stock tops as when I use the dual attachment, the pumps just won't turn on! (I'm guessing the blue impellor is compressed against the acryllic?)