This jet is compatible and is the replacement jet for all Arctic Spas from 2002 through 2006.  This is the 3" size.  It is the Twin Pulse Jet that feels like it pulsates faster but splits the pressure between two nozzles.  This jet is a special order.  The single pulse jet is a stock jet and is availabe to be shipped out immediately.  You can order it by clicking the link "3" Tri-Face Pulse Jet"