Aqua-Flo "XP" Series Pump was used during this time period and was phased into the Theramax, Theraflo Series. No longer available in the configuration used by Sundance, we have the upgrade from Sundance to retrofit your spa.
After using the Vico "Ultra Jet" Pump from 1994-1996, Sundance began using the Aqua-Flo "XP" Series Pumps and called them Theraflo and Theramax. They used the Aqua-Flo Pump specially designed for them primarily from 1997-1999. The newer design Theramax and Theraflo Pumps began to appear on some models.