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Circuit Board for the 1995-2000 SUNDANCE® 850 Systems. Choose Eprom Revision from drop-down below. 6600-017 (1995-1996 1 and 2 pump systems with RermaClear Eprom Rev. 1.28FB), 6600-018 (1995-1997 1 and 2 pump systems without PermaClear and for Inground Spas Eprom Rev. 1.29E+), 6600-023 (1999-2000 Maxxus 3 pump systems with ISO-Pure Eprom Rev. 1.30B).