Response to Hello Saki.  The Century 2.0 HP Square Flange 56Y Dual Speed Full Rate Motor - B2984 is compatible with the Hayward EcoStar SP3400VSP.  Tune Up Kit Hayward TriStar/EcoStar - GOKIT81 contains the seal and gaskets required for the new motor installation.  Attached please find the Hayward ProLogic I/O Manual   Please note the section - Timers Menu, pages 15 - 20, for information regarding dual speed pump programming.

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