Sundance Spa Temperature Sensor with Box End Connectors. Fits multiple spas. 1. 2012+ Aspen 2. 2005+ 880 Systems 3. 1997-2005 850 Systems. 400,600,600-S,750, 800 and 850 Systems. 4. 1992 Suncoast, 4/96-4/98 Suntub SV/DV Systems. 5. 1997+ 850 Systems 6. Replaces #6600-138 and 6600-105(not shown). 7. Interchangeable with 6600-182 sensor (stainless steel) with box end connectors. *For Inground Spas (spas with remote equipment with no skirt) see 6600-169.