Yea that seems to be the case. The units are not available for all models yet. The piece I built is a hack job. Basically I got a spare pump, surgically removed the PC board, slightly modded it, and encased it in a weather proof box. Plug and play to the original multi connector. This was done a couple of years ago. Still does the job. I would recommend the BSD unit as the pump mod route is a bit tedious and if you screw up the disassembly (easy to do) its junk and you have to source the correct pump in the first place.