http://www.amazon.com/HDE-Temperatur...4844501&sr=8-1
I had this one for awhile, it works pretty well. It does have a 1:1 ratio so i got concerned about the temps at the back of the tubs and ended up getting the pro exotics PE-2:
http://www.proexotics.com/store/home.php?cat=248
they both work great, but ultimately the pro exotics one fells better built and will probably last longer. Good Luck!
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